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A134928 Triplet composites. 3
4, 6, 8, 10, 12, 14, 16, 18, 20, 28, 30, 32, 40, 42, 44, 58, 60, 62, 70, 72, 74, 100, 102, 104, 106, 108, 110, 136, 138, 140, 148, 150, 152, 178, 180, 182, 190, 192, 194, 196, 198, 200, 226, 228, 230, 238, 240, 242, 268, 270, 272, 280, 282, 284 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Numbers that are composites and nearest-neighbors of twin primes.

LINKS

O. E. Pol, Determinacion geometrica de los numeros primos y compuesto.

EXAMPLE

28, 30 and 32 are triplet composites because 29 and 31 are twin primes and 28, 30 and 32 are composites and nearest-neighbors of 29 and 31.

CROSSREFS

Cf. Twin primes = A001097, Composite numbers = A002808.

Sequence in context: A093161 A111305 A175246 * A141109 A186331 A061344

Adjacent sequences:  A134925 A134926 A134927 * A134929 A134930 A134931

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol (info(AT)polprimos.com), Nov 16 2007

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Last modified February 14 05:09 EST 2012. Contains 205570 sequences.