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A154667 Averages of twin prime pairs such that p1*p2+AverageTwinPrime=prime. 1
4, 6, 30, 60, 138, 180, 240, 420, 618, 1050, 1608, 1698, 1788, 2268, 2310, 2730, 3258, 3390, 3528, 3768, 4158, 4218, 4338, 4800, 5640, 5868, 6660, 6690, 6870, 6960, 7488, 7548, 7590, 8538, 8628, 8970, 9630, 9858, 9930, 10458, 11118, 11970, 12540, 13338 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

3*5+4=19,5*7+6=41,...

LINKS

Table of n, a(n) for n=1..44.

FORMULA

A014574 INTERSECT A045546. [From R. J. Mathar, May 31 2010]

MATHEMATICA

lst={}; Do[If[PrimeQ[n-1]&&PrimeQ[n+1], If[PrimeQ[(n-1)*(n+1)+n], AppendTo[lst, n]]], {n, 8!}]; lst

CROSSREFS

Cf. A154666

Sequence in context: A056221 A046849 A090530 * A093121 A248048 A209298

Adjacent sequences:  A154664 A154665 A154666 * A154668 A154669 A154670

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jan 13 2009

STATUS

approved

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Last modified August 16 21:46 EDT 2018. Contains 313809 sequences. (Running on oeis4.)