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A171821 2 together with twin primes. 5
2, 3, 5, 7, 11, 13, 17, 19, 29, 31, 41, 43, 59, 61, 71, 73, 101, 103, 107, 109, 137, 139, 149, 151, 179, 181, 191, 193, 197, 199, 227, 229, 239, 241, 269, 271, 281, 283, 311, 313, 347, 349, 419, 421, 431, 433, 461, 463, 521, 523, 569, 571, 599, 601, 617, 619, 641 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes of the form p-1, p-2 and p+2 for p prime. - Juri-Stepan Gerasimov, Apr 30 2010

Numbers n such that A283265(n) = 0. - Mats Granvik, Mar 18 2017

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..10000

MATHEMATICA

Union@ Flatten@ Select[Partition[#, 2, 1] &@ Prime@ Range@ 117, First@ Differences@ # <= 2 &] (* Michael De Vlieger, Mar 18 2017 *)

CROSSREFS

Cf. A001097(twin primes), A283265.

Sequence in context: A176164 A141409 A238647 * A004051 A127047 A119615

Adjacent sequences:  A171818 A171819 A171820 * A171822 A171823 A171824

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Dec 19 2009

EXTENSIONS

Entries checked by D. S. McNeil, Nov 26 2010

STATUS

approved

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Last modified June 19 19:11 EDT 2019. Contains 324222 sequences. (Running on oeis4.)