A181669 - OEIS

A181669

Primes p of the form 6n-1 such that p-1 is a semiprime and p+2 is prime or prime squared.

5, 11, 23, 47, 59, 107, 167, 179, 227, 347, 359, 839, 1019, 1319, 1367, 1487, 1619, 2027, 2207, 2999, 3119, 3167, 3467, 4127, 4259, 4547, 4787, 4799, 5099, 5639, 5879, 6659, 6779, 6827, 7559, 8819, 10007, 10607, 11699, 12107, 12539, 14387, 14867, 15287, 15647

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OFFSET

1,1

COMMENTS

Except term 7, same as A181602.

LINKS

Table of n, a(n) for n=1..45.

MATHEMATICA

Select[6*Range[3000]-1, PrimeQ[#]&&PrimeOmega[#-1]==2&&AnyTrue[ {#+2, Sqrt[ #+2]}, PrimeQ]&] (* Harvey P. Dale, Jul 01 2022 *)

CROSSREFS

Sequence in context: A337437 A107010 A175942 * A362082 A306662 A052940

Adjacent sequences: A181666 A181667 A181668 * A181670 A181671 A181672

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Nov 18 2010

STATUS

approved