A031170 a(n) = prime(n+8) - prime(n).

21, 26, 26, 30, 30, 30, 30, 34, 36, 32, 36, 34, 32, 36, 36, 36, 38, 40, 36, 36, 36, 34, 44, 42, 40, 38, 46, 44, 48, 50, 40, 42, 42, 42, 42, 42, 40, 36, 44, 50, 48, 48, 42, 46, 44, 52, 46, 40, 42, 42, 44, 42, 42, 42, 50, 48, 44, 46, 54, 56, 64, 56, 46, 48, 54, 56, 48

Offset: 1

Author

Jeff Burch

Keywords

• nonn

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000040.

Cf. A001223, A031131, A031165, A031166, A031167, A031168, A031169, A031171, A031172.

Programs

Haskell

a031170 n = a031170_list !! (n-1)
a031170_list = zipWith (-) (drop 8 a000040_list) a000040_list
-- Reinhard Zumkeller, Aug 23 2015

Magma

[NthPrime(n+8)-NthPrime(n): n in [1..100] ]; // Vincenzo Librandi, Apr 23 2011

Maple

ithprime(n+8)-ithprime(n);

Mathematica

Table[Prime[n+8]-Prime[n],{n,1,100}]  (* Harvey P. Dale, Mar 23 2011 *)

Formula

a(n) = A000040(n+8) - A000040(n). - Zak Seidov, Mar 23 2011