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A228991 Primes p such that the p-th squarefree number is prime. 0
2, 3, 13, 29, 31, 37, 61, 67, 71, 103, 109, 139, 149, 167, 191, 223, 229, 241, 257, 263, 269, 271, 347, 349, 367, 379, 457, 487, 577, 607, 673, 689, 761, 797, 809, 907, 911, 967, 983, 1009, 1031, 1033, 1049, 1063, 1103, 1109, 1283, 1303, 1423, 1429, 1453 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

PROG

(PARI) lista(nn) = my(sqfs = select(n->issquarefree(n), vector(nn, i, i))); forprime(p = 2, #sqfs, if (isprime(sqfs[p]), print1(p, ", "))) \\ Michel Marcus, Sep 11 2013

CROSSREFS

Cf. A005117.

Subsequence of A071403.

Sequence in context: A029737 A191063 A105891 * A141585 A191021 A106867

Adjacent sequences:  A228988 A228989 A228990 * A228992 A228993 A228994

KEYWORD

nonn

AUTHOR

Irina Gerasimova, Sep 10 2013

STATUS

approved

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Last modified November 11 18:50 EST 2019. Contains 329031 sequences. (Running on oeis4.)