A350959 Number of ways to write 2*n+1 as 2^i (i >= 0) plus a prime.

0, 1, 1, 2, 2, 2, 2, 3, 1, 3, 4, 2, 2, 3, 1, 2, 3, 3, 2, 4, 1, 2, 5, 2, 3, 3, 1, 3, 2, 1, 3, 4, 1, 2, 5, 2, 2, 6, 3, 2, 3, 3, 2, 4, 1, 3, 3, 2, 1, 3, 2, 2, 6, 2, 2, 5, 2, 3, 4, 1, 2, 2, 2, 0, 3, 3, 3, 5, 1, 4, 4, 3, 3, 4, 0, 2, 4, 2, 2, 4, 2, 1, 5, 3, 3, 5, 2, 3, 2, 1, 4, 4, 1, 2, 4, 1, 1, 6, 2, 4, 5

Offset

0,4

Links

Table of n, a(n) for n=0..100.

Formula

a(n) = A109925(2*n+1). - R. J. Mathar, Mar 07 2022

Crossrefs

Cf. A006285, A350957, A109925.

Sequence in context: A005086 A358333 A237168 * A157372 A270559 A231727

Adjacent sequences: A350956 A350957 A350958 * A350960 A350961 A350962

Keyword

nonn

Author

N. J. A. Sloane, Feb 06 2022, answering a question from _David W. Lewis_.

Status

approved