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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
OFFSET
1,1
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
KEYWORD
nonn
AUTHOR
Ray G. Opao, May 11 2004
STATUS
approved