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A062972
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Chowla function of n is divisible by phi(n).
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3
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1, 2, 3, 4, 5, 7, 11, 13, 15, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Chowla's function (A048050) = sum of divisors of n except 1 and n.
Sequence contains all primes; see A070037 for nonprime terms. [From Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 14 2010]
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PROG
| (PARI) j=[]; for(n=1, 600, if(Mod(sigma(n)-n-1, eulerphi(n)) == 0, j=concat(j, n))); j
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CROSSREFS
| Sequence in context: A191876 A055464 A139316 * A036844 A033070 A046022
Adjacent sequences: A062969 A062970 A062971 * A062973 A062974 A062975
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KEYWORD
| nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Jul 24 2001
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