A013633 nextprime(n) - prevprime(n).

3, 2, 4, 2, 6, 4, 4, 4, 6, 2, 6, 4, 4, 4, 6, 2, 6, 4, 4, 4, 10, 6, 6, 6, 6, 6, 8, 2, 8, 6, 6, 6, 6, 6, 10, 4, 4, 4, 6, 2, 6, 4, 4, 4, 10, 6, 6, 6, 6, 6, 12, 6, 6, 6, 6, 6, 8, 2, 8, 6, 6, 6, 6, 6, 10, 4, 4, 4, 6, 2, 8, 6, 6, 6, 6, 6, 10, 4, 4

Offset: 3

Author

N. J. A. Sloane

Keywords

• nonn

Examples

			a(3) = nextprime(3) - prevprime(3) = 5 - 2 = 3: This shows that here the variants 2 (A151800 and A151799) of the nextprime and precprime functions are used, rather than the variants A007918 and A007917. - _M. F. Hasler_, Sep 09 2015
		

Links

• T. D. Noe, Table of n, a(n) for n=3..2000

Crossrefs

Cf. A151800, A007918; A151799, A007917.

Programs

Maple

[ seq(nextprime(i)-prevprime(i),i=3..100) ];

PARI

A013633(n)=nextprime(n+1)-precprime(n-1) \\ M. F. Hasler, Sep 09 2015

Formula

a(n) = A151800(n) - A151799(n) = A007918(n+1) - A007917(n-1). - M. F. Hasler, Sep 09 2015