A031939 Upper prime of a difference of 20 between consecutive primes.

907, 1657, 3109, 3433, 3967, 5737, 5923, 6007, 6823, 7669, 8263, 8563, 8803, 8887, 9277, 10243, 10453, 10687, 11047, 11113, 11197, 11467, 11617, 11677, 11887, 12007, 13147, 13441, 13669, 14107, 14197, 15493, 16963, 17539, 17827

Offset: 1

Author

Jeff Burch

Keywords

• nonn

Links

• Index entries for primes, gaps between

Crossrefs

Cf. A031937.

Programs

Mathematica

Prime[Select[Range[2, 5000], Prime[ # ] - Prime[ # - 1] == 20 &]] (* Stefan Steinerberger, May 14 2006 *)

Formula

a(n) = A031938(n)+20.