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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
OFFSET
1,1
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 *)
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 21 2006
EXTENSIONS
Extended by Ray Chandler, Jan 09 2007
STATUS
approved