A168322 - OEIS

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A168322

a(1)=3,a(2)=5; a(n+1)=smallest prime number > a(n-1) such that the sum of any three consecutive terms is a prime.

3, 5, 5, 7, 7, 17, 13, 23, 17, 31, 19, 47, 23, 61, 29, 67, 31, 83, 37, 103, 41, 107, 43, 113, 67, 127, 83, 137, 97, 139, 101, 149, 103, 157, 107, 167, 109, 173, 127, 179, 137, 193, 149, 199, 151, 227, 163, 229, 179, 233, 181, 239, 193, 241, 197, 263, 199, 271, 239

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..59.

MATHEMATICA

a=3; b=5; lst={a, b}; Do[Do[If[PrimeQ[q]&&PrimeQ[a+b+q], c=q; Break[]], {q, a+2, 9!, 2}]; AppendTo[lst, c]; a=b; b=c, {n, 6!}]; lst

CROSSREFS

Cf. A062391

Sequence in context: A109258 A088081 A206768 * A138475 A195990 A023840

Adjacent sequences: A168319 A168320 A168321 * A168323 A168324 A168325

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Nov 22 2009

STATUS

approved