Sum of prime numbers 
Compute the sum of all prime numbers in a stream of binary integers as fast as possible.
Input: 1 000 000 uint32 values in little-endian binary on STDIN (4 bytes each).
Output: The uint64 sum of all values that are prime, printed as a decimal string.
Source Code
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Challenge History
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Run Statistics
| # | Date | Score | Wall Time | CPU User | CPU System | Memory | Error | |
|---|---|---|---|---|---|---|---|---|
| 1 | Jan 17, 2026 18:01 | 3,344 | 16,705,272 | 1,962,000 | 981,000 | 2,277,376 | ||
| 2 | Jan 17, 2026 02:50 | 3,348 | 17,365,737 | 1,964,000 | 982,000 | 2,355,200 | ||
| 3 | Jan 17, 2026 18:01 | 3,349 | 24,950,705 | 1,965,000 | 982,000 | 2,355,200 | ||
| 4 | Jan 17, 2026 02:27 | 3,349 | 26,379,321 | 2,947,000 | 0 | 2,277,376 | ||
| 5 | Jan 17, 2026 02:27 | 3,352 | 21,539,116 | 1,967,000 | 983,000 | 2,273,280 | ||
| 6 | Jan 23, 2026 04:00 | 3,352 | 18,029,264 | 1,967,000 | 983,000 | 2,359,296 | ||
| 7 | Jan 17, 2026 02:50 | 3,361 | 21,014,040 | 2,958,000 | 0 | 2,355,200 | ||
| 8 | Jan 17, 2026 02:28 | 3,366 | 14,892,528 | 1,975,000 | 987,000 | 2,355,200 | ||
| 9 | Jan 17, 2026 02:27 | 3,366 | 25,525,097 | 1,975,000 | 987,000 | 2,351,104 | ||
| 10 | Jan 24, 2026 01:57 | 3,369 | 23,743,344 | 2,965,000 | 0 | 2,277,376 | ||
| 11 | Jan 22, 2026 03:23 | 3,369 | 18,052,931 | 1,977,000 | 988,000 | 2,367,488 | ||
| 12 | Jan 24, 2026 01:05 | 3,373 | 23,749,782 | 1,979,000 | 989,000 | 2,277,376 | ||
| 13 | Jan 17, 2026 18:01 | 3,373 | 18,355,002 | 1,979,000 | 989,000 | 2,359,296 | ||
| 14 | Jan 24, 2026 01:05 | 3,373 | 16,270,136 | 1,979,000 | 989,000 | 2,277,376 | ||
| 15 | Jan 17, 2026 02:50 | 3,376 | 16,567,359 | 1,981,000 | 990,000 | 2,355,200 | ||
| 16 | Jan 24, 2026 01:57 | 3,378 | 20,795,139 | 1,982,000 | 991,000 | 2,347,008 | ||
| 17 | Jan 17, 2026 02:27 | 3,380 | 21,844,527 | 1,983,000 | 991,000 | 2,347,008 | ||
| 18 | Jan 17, 2026 02:28 | 3,382 | 17,049,808 | 1,984,000 | 992,000 | 2,277,376 | ||
| 19 | Jan 24, 2026 20:20 | 3,385 | 21,916,559 | 1,986,000 | 993,000 | 2,351,104 | ||
| 20 | Jan 23, 2026 04:00 | 3,389 | 21,518,130 | 1,988,000 | 994,000 | 2,359,296 | ||
| 21 | Jan 24, 2026 01:38 | 3,389 | 21,568,594 | 1,988,000 | 994,000 | 2,359,296 | ||
| 22 | Jan 17, 2026 18:01 | 3,390 | 23,258,196 | 1,989,000 | 994,000 | 2,355,200 | ||
| 23 | Jan 17, 2026 18:01 | 3,392 | 21,073,523 | 1,990,000 | 995,000 | 2,359,296 | ||
| 24 | Jan 17, 2026 02:27 | 3,399 | 24,774,728 | 1,994,000 | 997,000 | 2,355,200 | ||
| 25 | Jan 17, 2026 02:46 | 3,399 | 17,240,439 | 1,994,000 | 997,000 | 2,351,104 | ||
| 26 | Jan 22, 2026 04:43 | 3,400 | 18,127,739 | 1,995,000 | 997,000 | 2,351,104 | ||
| 27 | Jan 24, 2026 01:38 | 3,406 | 21,528,259 | 1,998,000 | 999,000 | 2,363,392 | ||
| 28 | Jan 17, 2026 02:50 | 3,407 | 19,390,405 | 1,999,000 | 999,000 | 2,355,200 | ||
| 29 | Jan 24, 2026 01:05 | 3,409 | 20,919,504 | 2,000,000 | 1,000,000 | 2,277,376 | ||
| 30 | Jan 24, 2026 20:20 | 3,413 | 22,499,207 | 1,001,000 | 2,002,000 | 2,355,200 | ||
| 31 | Jan 22, 2026 04:43 | 3,413 | 19,993,422 | 2,002,000 | 1,001,000 | 2,359,296 | ||
| 32 | Jan 23, 2026 04:03 | 3,413 | 21,108,223 | 2,002,000 | 1,001,000 | 2,355,200 | ||
| 33 | Jan 23, 2026 04:00 | 3,419 | 25,458,741 | 2,006,000 | 1,003,000 | 2,277,376 | ||
| 34 | Jan 17, 2026 02:27 | 3,426 | 18,224,040 | 2,010,000 | 1,005,000 | 2,277,376 | ||
| 35 | Jan 22, 2026 03:23 | 3,430 | 17,693,877 | 1,006,000 | 2,012,000 | 2,355,200 | ||
| 36 | Jan 24, 2026 01:57 | 3,430 | 20,048,063 | 1,006,000 | 2,012,000 | 2,355,200 | ||
| 37 | Jan 17, 2026 02:46 | 3,443 | 19,177,643 | 2,020,000 | 1,010,000 | 2,277,376 | ||
| 38 | Jan 17, 2026 02:46 | 3,443 | 22,477,626 | 2,020,000 | 1,010,000 | 2,535,424 | ||
| 39 | Jan 24, 2026 20:20 | 3,447 | 19,416,689 | 1,011,000 | 2,022,000 | 2,363,392 | ||
| 40 | Jan 17, 2026 02:27 | 3,447 | 17,420,546 | 1,011,000 | 2,022,000 | 2,453,504 | ||
| 41 | Jan 17, 2026 18:01 | 3,460 | 16,592,560 | 1,015,000 | 2,030,000 | 2,355,200 | ||
| 42 | Jan 17, 2026 18:01 | 3,461 | 25,893,090 | 1,015,000 | 2,031,000 | 2,363,392 | ||
| 43 | Jan 17, 2026 02:50 | 3,461 | 21,324,565 | 2,031,000 | 1,015,000 | 2,355,200 | ||
| 44 | Jan 22, 2026 04:43 | 3,466 | 15,491,821 | 3,050,000 | 0 | 2,519,040 | ||
| 45 | Jan 17, 2026 02:50 | 3,467 | 19,876,534 | 2,034,000 | 1,017,000 | 2,482,176 | ||
| 46 | Jan 17, 2026 02:27 | 3,474 | 24,526,602 | 2,038,000 | 1,019,000 | 2,359,296 | ||
| 47 | Jan 24, 2026 01:38 | 3,488 | 16,875,877 | 2,046,000 | 1,023,000 | 2,363,392 | ||
| 48 | Jan 17, 2026 02:50 | 3,515 | 19,426,794 | 2,062,000 | 1,031,000 | 2,478,080 | ||
| 49 | Jan 17, 2026 18:01 | 3,528 | 25,596,712 | 1,035,000 | 2,070,000 | 2,351,104 | ||
| 50 | Jan 17, 2026 02:50 | 3,528 | 23,897,650 | 2,070,000 | 1,035,000 | 2,277,376 | ||
| 51 | Jan 24, 2026 01:04 | 3,540 | 21,499,485 | 2,077,000 | 1,038,000 | 2,363,392 | ||
| 52 | Jan 17, 2026 02:27 | 3,557 | 16,925,165 | 2,087,000 | 1,043,000 | 2,355,200 | ||
| 53 | Jan 24, 2026 01:04 | 3,560 | 23,771,279 | 2,089,000 | 1,044,000 | 2,367,488 | ||
| 54 | Jan 23, 2026 04:03 | 3,564 | 21,125,071 | 2,091,000 | 1,045,000 | 2,359,296 | ||
| 55 | Jan 17, 2026 02:50 | 3,591 | 18,463,374 | 1,053,000 | 2,107,000 | 2,355,200 | ||
| 56 | Jan 22, 2026 03:23 | 3,809 | 18,635,666 | 2,235,000 | 1,117,000 | 2,347,008 | ||
| 57 | Jan 17, 2026 02:28 | 4,303 | 21,733,844 | 3,787,000 | 0 | 2,355,200 | ||
| 58 | Jan 24, 2026 01:04 | 4,306 | 25,743,556 | 3,789,000 | 0 | 2,359,296 | ||
| 59 | Jan 23, 2026 04:03 | 4,409 | 20,187,654 | 1,940,000 | 1,940,000 | 2,531,328 | ||
| 60 | Jan 17, 2026 18:01 | 4,455 | 20,954,180 | 2,940,000 | 980,000 | 2,355,200 |