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Search: id:A037175
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| A037175 |
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Numbers n such that |s(n)-n| = number of primes <= n, where s(n) is sigma(n)-n. |
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+0
1
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OFFSET
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1,1
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MAPLE
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with(numtheory):np:=0: for n from 1 to 300000 do if isprime(n) then np:=np+1 fi: if(abs(sigma(n)-2*n)=np) then printf("%d, ", n) fi od: (C. Ronaldo)
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PROGRAM
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(PARI) np=0; for(n=1, 10000000, if(isprime(n), np=np+1); if(abs(sigma(n)-2*n)==np, print1(n, ", "))) (Ronaldo)
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CROSSREFS
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Adjacent sequences: A037172 A037173 A037174 this_sequence A037176 A037177 A037178
Sequence in context: A066491 A101507 A047176 this_sequence A048613 A030072 A064219
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KEYWORD
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nonn
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AUTHOR
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Naohiro Nomoto (6284968128(AT)geocities.co.jp)
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EXTENSIONS
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More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 30 2004
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