Posted: 9/12/2012 2:32:15 PM EDT
Which aren't Prime Numbers
907 - 911 - 919 - 929 - 937 - 941 - 947 - 953 - 967 - 971 - 977 - 983 - 991 - 997 - 1009 - 1013 - 1019 - 1021 - 1031 - 1033 - 1039 - 1047 - 1049 - 1051 - 1061 - 1069 - 1087 - 1091 - 1093 - 1097 - 1103 - 1109 - 1117 - 1123 - 1129 - 1141 - 1151 - 1153 - 1163 - 1171 - 1181 - 1187 - 1197 -1201 - 1213 - 1217- 1223 - 1239 - 1249 - 1259 - 1277 - 1279 - 1283 |
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What is this madness???? ETA: Per http://www.prime-numbers.org/prime-number-906-5906.htm 1047, 1063, 1141, 1197, and 1239 are not. You skipped 1193, 1229, 1231, and 1237. I'm truly confused as to whether you're testing an algorithm, seeing if someone is a genius and can just list off the prime numbers, or just making a joke by having nerds like me look it up just to satisfy their curiosity.
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For fun I cooked up the Sieve of Eratosthenes on an Excel spreadsheet. Every once in a while I add a few more numbers. I've been doing it for over a year now. On the Sieve, if a number is Not a Prime it's set up to say YES, otherwise it says "no".
A few months ago I found a mistake and had to redo several dozen numbers. It looks like I missed some numbers again. 
=IF(INT($B$2/A4)=($B$2/A4),"YES","no") The bold YES was to make it easier to see where the Subject Number can be divided into any of the numbers already found as Primes. Obviously I missed more numbers.... |