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A267504 Primes p such that p-1 is squarefree and all prime divisors of p-1 other than 11 are also in the sequence. 4
2, 3, 7, 23, 43, 47, 67, 139, 283, 463, 659, 947, 967, 1319, 1699, 1979, 3083, 4423, 5683, 5839, 6299, 9227, 10627, 11887, 13259, 18679, 19183, 19447, 19867, 21407, 26539, 30559, 35863, 37379, 39199, 41539, 44087, 44483, 45403, 55399, 63823, 71347, 71359, 74759, 91127, 91463, 115099, 130687, 132527 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Is this sequence infinite?

LINKS

Table of n, a(n) for n=1..49.

MATHEMATICA

fa = FactorInteger; is[2, p_] = True; is[2, p_];

is[n_, p_] := PrimeQ[n] &&  MoebiusMu[n - 1] ≠ 0 && Union@Table[is[fa[n - 1][[i, 1]], p] || fa[n - 1][[ i, 1]] == p , {i, Length[fa[n - 1]]}] == {True}; Select[Prime[Range[10000]], is[#, 11] &]

CROSSREFS

Cf. A267503, A267505, A267506, A267507, A005117, A227455, A227007, A227006.

Sequence in context: A072686 A002230 A106865 * A000057 A037231 A248525

Adjacent sequences:  A267501 A267502 A267503 * A267505 A267506 A267507

KEYWORD

nonn

AUTHOR

José María Grau Ribas, Jan 16 2016

STATUS

approved

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Last modified May 26 00:47 EDT 2022. Contains 354073 sequences. (Running on oeis4.)