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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. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 28 19:16 EDT 2021. Contains 347717 sequences. (Running on oeis4.)