A048974 Odd numbers that are the sum of 2 primes.

5, 7, 9, 13, 15, 19, 21, 25, 31, 33, 39, 43, 45, 49, 55, 61, 63, 69, 73, 75, 81, 85, 91, 99, 103, 105, 109, 111, 115, 129, 133, 139, 141, 151, 153, 159, 165, 169, 175, 181, 183, 193, 195, 199, 201, 213, 225, 229, 231, 235, 241, 243, 253, 259

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Comments

A048974, A052147, A067187 and A088685 are very similar after dropping terms less than 13. - Eric W. Weisstein, Oct 10 2003

Links

• Robert Price, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A014092, A065091.

Programs

Mathematica

Select[Flatten@Table[Prime[i] + Prime[j], {i, 100}, {j, 1, i}], # < Prime[100] && OddQ[#] &] (* Robert Price, Apr 21 2025 *)

Formula

One of the primes must be 2, so this is simply the odd primes + 2.

a(n) = A065091(n) + 2. - Sean A. Irvine, Jul 15 2021