A046925 Number of ways to express 2n+1 as p+2q; p, q = 1 or prime.

0, 1, 2, 3, 3, 3, 3, 4, 4, 3, 4, 4, 4, 5, 4, 3, 6, 4, 4, 6, 5, 5, 7, 5, 5, 7, 5, 4, 7, 4, 4, 9, 7, 5, 8, 4, 5, 10, 7, 5, 9, 5, 8, 9, 7, 5, 11, 6, 6, 10, 6, 6, 13, 7, 7, 11, 8, 7, 11, 8, 5, 12, 8, 6, 11, 6, 7, 14, 8, 6, 14, 7, 9, 13, 8, 7, 15, 8, 6, 13, 10, 9, 17, 6, 9, 13, 9, 10, 14, 8, 7

Offset

0,3

Links

Table of n, a(n) for n=0..90.

L. Hodges, A lesser-known Goldbach conjecture, Math. Mag., 66 (1993), 45-47.

Index entries for sequences related to Goldbach conjecture

Crossrefs

Sequence in context: A093493 A087162 A288914 * A090529 A297212 A155934

Adjacent sequences: A046922 A046923 A046924 * A046926 A046927 A046928

Keyword

nonn

Author

David W. Wilson

Status

approved