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A105454 Numbers n such that n*prime(n)+(n+1)*prime(n+1) is prime. +0
2
3, 4, 6, 7, 8, 10, 12, 14, 15, 18, 19, 20, 21, 24, 25, 26, 29, 32, 34, 35, 49, 50, 54, 57, 59, 60, 62, 72, 77, 79, 87, 89, 94, 101, 104, 111, 115, 132, 134, 137, 138, 140, 141, 142, 148, 154, 161, 162, 164, 167, 168, 180, 181, 182, 183, 186, 190, 192, 195, 203, 204 (list; graph; listen)
OFFSET

1,1

MATHEMATICA

bb={}; Do[If[PrimeQ[n Prime[n]+(n+1)Prime[n+1]], bb=Append[bb, n]], {n, 400}]; bb

CROSSREFS

Adjacent sequences: A105451 A105452 A105453 this_sequence A105455 A105456 A105457

Sequence in context: A039042 A007378 A087758 this_sequence A127260 A089530 A133512

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), May 02 2005

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Last modified January 8 02:43 EST 2009. Contains 152824 sequences.


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