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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

%I

%S 3,857,1487,31847,38447,59357,142607,153947,157217,212867,264527,

%T 313127,340337,375707,427067,454577,547397,558827,568187,607337,

%U 613007,723167,723587,891677,963707

%N 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.

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

%Y Cf. A093245.

%K nonn

%O 1,1

%A _Ray G. Opao_, May 11 2004

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Last modified October 25 21:15 EDT 2021. Contains 348256 sequences. (Running on oeis4.)