A138658 - OEIS

A138658

Primes p such that 54*p-1 and 54*p+1 are twin primes.

2, 5, 37, 83, 173, 223, 257, 313, 673, 1093, 1217, 1447, 1667, 1777, 1933, 1973, 1997, 2273, 2393, 2423, 2473, 2557, 2767, 2843, 2857, 3467, 3767, 3877, 4073, 4513, 4957, 5273, 5657, 5783, 5867, 6047, 6427, 6977, 7307, 7867, 9007, 9137, 9227, 9343, 9697

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

H. v. Eitzen, Table of n, a(n) for n=1,.., 10513 (i.e. all a(n) below 10^7)

EXAMPLE

54*2-1=107, 54*2+1=109; 54*5-1=269, 54*5+1=271; ...

MATHEMATICA

a=54; Select[Prime[Range[10^3]], PrimeQ[a*#-1]&&PrimeQ[a*#+1]&]

Select[Prime[Range[1200]], AllTrue[54#+{1, -1}, PrimeQ]&] (* Harvey P. Dale, Mar 01 2023 *)

CROSSREFS

Sequence in context: A163499 A086218 A202637 * A089195 A067464 A081545