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

1,1

Links

Table of n, a(n) for n=1..48.

Formula

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

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 *)

Crossrefs

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

Sequence in context: A029708 A125215 A102739 * A189051 A274288 A172292

Adjacent sequences: A124619 A124620 A124621 * A124623 A124624 A124625

Keyword

nonn

Author

Artur Jasinski, Dec 21 2006

Extensions

Extended by Ray Chandler, Jan 09 2007

Status

approved