A076198 a(n)=least s>0 such that n!!-s is prime.

1, 1, 2, 1, 2, 1, 4, 7, 4, 7, 4, 23, 2, 1, 2, 97, 2, 19, 64, 17, 62, 19, 4, 1, 58, 23, 64, 157, 122, 47, 106, 47, 4, 29, 146, 31, 64, 29, 8, 71, 8, 43, 32, 31, 128, 67, 122, 41, 2, 37, 146, 137, 122, 191, 142, 59, 128, 71, 284, 109, 274, 1, 218, 97, 32, 83, 158, 53, 166

Offset

3,3

Comments

Unlike the case n!!+s in A057019, there is no apparent rule for s here.

Links

Table of n, a(n) for n=3..71.

Crossrefs

Cf. A057019.

Sequence in context: A058511 A331982 A106380 * A032021 A306703 A295686

Adjacent sequences: A076195 A076196 A076197 * A076199 A076200 A076201

Keyword

nonn

Author

Zak Seidov, Nov 02 2002

Status

approved