A124622 Smallest odd interprime divisible by n-th odd prime.

9, 15, 21, 99, 39, 459, 399, 69, 667, 93, 111, 205, 129, 705, 1113, 885, 915, 2613, 1207, 803, 1817, 747, 1869, 2619, 909, 309, 2247, 7957, 1243, 381, 393, 3699, 2085, 3129, 453, 8635, 489, 501, 16089, 1611, 5249, 9741, 1737, 2955, 2985, 3165, 2007, 19295

Offset: 1

Author

Artur Jasinski, Dec 21 2006

Keywords

• nonn

Crossrefs

Cf. A072569, A072572, A072573, A126228, A126229, A126230, A124619, A124620, A126231.

Programs

Mathematica

f[n_] := Block[{k = 1, c},While[c = (Prime[k + 1] + Prime[k])/2; Mod[c, 2] == 0 || Mod[c, Prime[n + 1]] > 0, k++ ];c];Table[f[n], {n, 50}] (* Ray Chandler, Jan 09 2007 *)

Formula

a(n) = (prime(A126233(n)+1) + prime(A126233(n)))/2.

Extensions

Extended by Ray Chandler, Jan 09 2007