A093189 - OEIS

A093189

Let P(x) = (x^2+1)^2+1; then a(n) is the lesser term of a twin prime pair such that P(a(n)) is also the lesser term of another twin prime pair.

3, 857, 1487, 31847, 38447, 59357, 142607, 153947, 157217, 212867, 264527, 313127, 340337, 375707, 427067, 454577, 547397, 558827, 568187, 607337, 613007, 723167, 723587, 891677, 963707

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

a(2)=857: 857 and 859 are twin primes. (857^2+1)^2+1 = 539416802501. 539416802501 and 539416802503 are also twin primes.

CROSSREFS

Cf. A093245.

Sequence in context: A252762 A341574 A283017 * A163430 A203688 A253578

Adjacent sequences: A093186 A093187 A093188 * A093190 A093191 A093192

KEYWORD

nonn

AUTHOR

Ray G. Opao, May 11 2004

STATUS

approved