A147683 - OEIS

A147683

Numbers n with property that 6n-1 is in A053182.

1, 3, 7, 10, 12, 15, 17, 22, 28, 29, 49, 64, 113, 117, 124, 127, 129, 138, 140, 143, 152, 182, 183, 194, 197, 199, 203, 229, 238, 248, 260, 264, 285, 302, 308, 322, 329, 355, 379, 385, 390, 402, 444, 455, 465, 493, 495, 502, 507, 523, 537, 542, 568, 575, 582

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..55.

PROG

(PARI) isok(n) = isprime(p=6*n-1) && isprime(p^2+p+1); \\ Michel Marcus, Oct 15 2013

CROSSREFS

Cf. A053182.

Sequence in context: A276117 A105135 A225552 * A319279 A013574 A235915

Adjacent sequences: A147680 A147681 A147682 * A147684 A147685 A147686

KEYWORD

nonn

AUTHOR

Zak Seidov, Nov 10 2008

STATUS

approved