A154563 - OEIS

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A154563

Averages of twin prime pairs of A074378.

18, 60, 138, 150, 1278, 1620, 2730, 4128, 6360, 11718, 13398, 17490, 20808, 23028, 28308, 29670, 51870, 61380, 69828, 73848, 78540, 92568, 97500, 115770, 138570, 166668, 176610, 193380, 200928, 258318, 304980, 430008, 500910, 518760, 536190

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OFFSET

1,1

COMMENTS

18-1=17;18+1=19,...

LINKS

Table of n, a(n) for n=1..35.

MATHEMATICA

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

CROSSREFS

Sequence in context: A056438 A218617 A105521 * A325043 A338536 A090073

Adjacent sequences: A154560 A154561 A154562 * A154564 A154565 A154566

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jan 12 2009

STATUS

approved