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A070957 Primes p such that the equation sigma(x)=p has no solution. 0
2, 5, 11, 17, 19, 23, 29, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 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, 271, 277, 281, 283, 293 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..57.

PROG

(PARI) for(n=1, 100, if(sum(j=1, n, if(sigma(j)-n, 1-isprime(n), 1))==0, print1(n, ", ")))

CROSSREFS

Cf. A007369.

Sequence in context: A118660 A009770 A132121 * A166744 A080165 A239712

Adjacent sequences:  A070954 A070955 A070956 * A070958 A070959 A070960

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, May 16 2002

STATUS

approved

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)