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 A213902 Number of integers of the form 6*k+1 and 6*k-1 between prime(n) and prime(n+1). 2
 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 2, 0, 0, 0, 0, 0, 4, 0, 1, 0, 2, 0, 1, 1, 0, 1, 1, 0, 2, 0, 0, 0, 3, 3, 0, 0, 0, 1, 0, 2, 1, 1, 1, 0, 1, 0, 0, 2, 4, 0, 0, 0, 4, 1, 2, 0, 0, 1, 2, 1, 1, 0, 1, 2, 0, 2, 2, 0, 2, 0, 1, 0, 1, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,24 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 MATHEMATICA nn = 100; t = Join[{3}, Union[6*Range[nn] - 1, 6*Range[nn] + 1]]; cnt = 0; t2 = {}; Do[If[PrimeQ[t[[i]]], AppendTo[t2, cnt]; cnt = 0, cnt++], {i, Length[t]}]; t2 (* T. D. Noe, Jun 26 2012 *) Module[{nn=90, k61}, k61=Flatten[#+{1, 5}&/@(6Range[0, Prime[nn+1]])]; Table[ Count[ k61, _?(Prime[n]<#

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Last modified January 19 21:47 EST 2020. Contains 331066 sequences. (Running on oeis4.)