A350957 Number of ways to write 2*n as 3^i (i >= 0) plus a prime.

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

Offset: 1

Author

N. J. A. Sloane, Feb 05 2022

Keywords

• nonn

Crossrefs

Cf. A006285, A058517, A350628-A350630, A350958, A282432.

Formula

a(n) = A282432(2*n). - R. J. Mathar, Mar 07 2022