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

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 * A067464 A081545 A274074

Adjacent sequences: A138655 A138656 A138657 * A138659 A138660 A138661

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 15 2008

Extensions

More terms from b-file by Hagen von Eitzen, Jun 17 2009

Status

approved