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A171821 2 together with twin primes. 5

%I #19 Mar 28 2017 14:42:03

%S 2,3,5,7,11,13,17,19,29,31,41,43,59,61,71,73,101,103,107,109,137,139,

%T 149,151,179,181,191,193,197,199,227,229,239,241,269,271,281,283,311,

%U 313,347,349,419,421,431,433,461,463,521,523,569,571,599,601,617,619,641

%N 2 together with twin primes.

%C Primes of the form p-1, p-2 and p+2 for p prime. - _Juri-Stepan Gerasimov_, Apr 30 2010

%C Numbers n such that A283265(n) = 0. - _Mats Granvik_, Mar 18 2017

%H Michael De Vlieger, <a href="/A171821/b171821.txt">Table of n, a(n) for n = 1..10000</a>

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

%Y Cf. A001097(twin primes), A283265.

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Dec 19 2009

%E Entries checked by _D. S. McNeil_, Nov 26 2010

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Last modified March 28 04:58 EDT 2024. Contains 371235 sequences. (Running on oeis4.)