A175194 a(n) = the smallest factorial such that (the n-th prime)+a(n) is prime, or -1 if no such prime exists..

1, 2, 2, 6, 2, 6, 2, 24, 6, 2, 6, 6, 2, 24, 6, 6, 2, 6, 6, 2, 6, 24, 6, 24, 6, 2, 6, 2, 120, 24, 24, 6, 2, 24, 2, 6, 6, 120, 6, 6, 2, 362880, 2, 6, 2, 24, 120, 6, 2, 120, 6, 2, 5040, 6, 6, 6, 2, 6, 6, 2, 24, 24, 6, 2, 24, 40320, 6, 120, 2, 24, 6, 24, 6, 6, 120, 6, 120, 24, 120, 24, 2, 120, 2

Offset

1,2

Comments

a(n) = A175193(n)!.

Links

Table of n, a(n) for n=1..83.

Formula

A092789(n) = A000040(n) + a(n).

Crossrefs

Cf. A082470, A092789, A175193.

Sequence in context: A278162 A187223 A349921 * A086568 A351091 A239074

Adjacent sequences: A175191 A175192 A175193 * A175195 A175196 A175197

Keyword

nonn

Author

Leroy Quet, Mar 01 2010

Extensions

Extended by Ray Chandler, Mar 04 2010

Status

approved