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A154565 One-half of averages of twin prime pairs of A001318. 1
2, 15, 51, 210, 330, 651, 1365, 1650, 1926, 3480, 5430, 5985, 6501, 11310, 16485, 16590, 21660, 25026, 27270, 28635, 35190, 38001, 39285, 46905, 48690, 58905, 64170, 90651, 109485, 143376, 148995, 151845, 190995, 311676, 316251, 332526 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

MATHEMATICA

q=3; lst={}; s=0; Do[s+=n/q; If[Floor[s]==s, If[PrimeQ[2*s-1]&&PrimeQ[2*s+1], AppendTo[lst, s]]], {n, 0, 8!}]; lst

CROSSREFS

Cf. A154563, A074378.

Sequence in context: A025213 A290631 A116693 * A066562 A073877 A248538

Adjacent sequences:  A154562 A154563 A154564 * A154566 A154567 A154568

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jan 12 2009

STATUS

approved

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Last modified September 29 12:15 EDT 2020. Contains 337431 sequences. (Running on oeis4.)