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A230559 Pseudoprimes n to base 2 such that n-2, n+2 and n+4 are primes. 3

%I #21 Jan 29 2014 01:05:04

%S 634038307449,4846359321105,11927878640385,20835183400305,

%T 34166605315305,54096163177785,63154533545265,88365393281985,

%U 189080281720065,850943773070385,917252751841665,1278728202166185,1602254869802049,3742704749436465,6082185264252945

%N Pseudoprimes n to base 2 such that n-2, n+2 and n+4 are primes.

%C All numbers in this sequence end in either 5 or 9.

%H Shyam Sunder Gupta, <a href="/A230559/b230559.txt">Table of n, a(n) for n = 1..82</a>

%e 634038307449 is a pseudoprime (base 2) and 634038307447, 634038307451 and 634038307453 are primes.

%Y Cf. A001567, A057942, A230488, A230489, A228575.

%K nonn

%O 1,1

%A _Shyam Sunder Gupta_, Oct 27 2013

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Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)