A054775 - OEIS

A054775

Positive multiples of 6 which are not the midpoint of a pair of twin primes.

24, 36, 48, 54, 66, 78, 84, 90, 96, 114, 120, 126, 132, 144, 156, 162, 168, 174, 186, 204, 210, 216, 222, 234, 246, 252, 258, 264, 276, 288, 294, 300, 306, 318, 324, 330, 336, 342, 354, 360, 366, 372, 378, 384, 390, 396, 402, 408, 414, 426, 438, 444, 450, 456, 468, 474

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..56.

PROG

(Magma) [ n: n in [6..600 by 6] | not IsPrime(n-1) or not IsPrime(n+1) ]; // Klaus Brockhaus, Aug 18 2010

(PARI) forstep(n=6, 600, 6, if(!(isprime(n-1)&&isprime(n+1)), print1(n, ", "))) \\ Klaus Brockhaus, Aug 18 2010

CROSSREFS

Cf. A067611 (sequence divided by 6).

Sequence in context: A290016 A330880 A195008 * A273088 A334674 A067766

Adjacent sequences: A054772 A054773 A054774 * A054776 A054777 A054778

KEYWORD

nonn

AUTHOR

Stuart M. Ellerstein (ellerstein(AT)aol.com), May 19 2000

EXTENSIONS

Corrected by Zak Seidov and Klaus Brockhaus, Aug 18 2010

Edited by N. J. A. Sloane, Aug 19 2010

STATUS

approved