A155766 Least prime p such that p + 2n is prime, but not both p+2k and p+2(n-k) are prime for 0 < k < n.

2, 3, 7, 5, 23, 19, 19, 47, 43, 13, 107, 211, 37, 101, 73, 31, 191, 199, 103, 239, 271, 107, 569, 313, 179, 281, 397, 109, 491, 463, 191, 857, 919, 113, 503, 283, 491, 1619, 523, 199, 659, 691, 223, 821, 1321, 241, 1307, 1627, 293, 1373, 1621, 751, 2399, 823, 499

Offset

0,1

Comments

Does a(n) exist for all n? It appears that a(3n) is less than a(3n-1) and a(3n+1) for all n except 2 and 12.

Links

T. D. Noe, Table of n, a(n) for n = 0..2000

Formula

a(n) = A103147(n) - n = A155767(n) - 2n.

Crossrefs

Sequence in context: A038026 A051860 A351494 * A153488 A275115 A085399

Adjacent sequences: A155763 A155764 A155765 * A155767 A155768 A155769

Keyword

nonn

Author

T. D. Noe, Jan 27 2009

Status

approved