A229092 First member of a prime 5-tuple in a p^2+p-1 progression.

3, 20963909, 45608209, 46939069, 57856709, 73805093, 83307563, 83983931, 89836889, 90151643, 95786459, 98527859, 98886679, 116260099, 118084559, 118955549, 153404593, 155710213, 190926341, 204854891, 221010899, 238175309, 271884073, 295874083, 299614369

Offset

1,1

Comments

Subsequence of A057325.

Links

Pierre CAMI, Table of n, a(n) for n = 1..62

Mathematica

pqQ[p_]:=AllTrue[Rest[NestList[#^2+#-1&, p, 4]], PrimeQ]; Select[Prime[ Range[ 16232600]], pqQ] (* Harvey P. Dale, Oct 16 2021 *)

Prog

(PARI) is(n)=for(k=1, 5, if(!isprime(n), return(0)); n=n^2+n-1); 1 \\ Charles R Greathouse IV, Sep 13 2013

Crossrefs

Cf. A057325

Sequence in context: A244113 A324425 A117721 * A058469 A367670 A081508

Adjacent sequences: A229089 A229090 A229091 * A229093 A229094 A229095

Keyword

nonn

Author

Pierre CAMI, Sep 13 2013

Status

approved