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A124622 Smallest odd interprime divisible by n-th odd prime. 7
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 (list; graph; refs; listen; history; text; internal format)
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}] (*Chandler*)

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

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Last modified May 24 17:39 EDT 2019. Contains 323534 sequences. (Running on oeis4.)