A162706 Numbers that are the sum of two reversed primes.

4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81

Offset: 1

Author

Claudio Meller, Jul 11 2009

Keywords

• nonn
• base
• less

Formula

a(n) = A004087(j)+A004087(k) for any pair (j,k). - R. J. Mathar, Jul 13 2009

Extensions

Edited, entries checked by R. J. Mathar, Jul 13 2009