A175194 - OEIS

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A175194

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

3

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

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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: A187223 A349921 A393059 * 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