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 A274792 a(n) = smallest prime p(1) in a symmetrical constellation of n consecutive twin primes: p(1), p(1)+2, ..., p(n), p(n)+2. 4
 3, 5, 5, 663569, 3031329797, 17479880417, 1855418882807417, 2640138520272677 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS N. Makarova and C. Rivera, Symmetrical compositions of consecutive twin primes. EXAMPLE The list of two consecutive twin primes (5, 7, 11, 13) is symmetrical because 5+13 = 7+11. Thus a(2) = 5. The list of three consecutive twin primes (5, 7, 11, 13, 17, 19) is symmetrical because 5+19 = 7+17 = 11+13. Thus a(3) = 5. CROSSREFS Cf. A077800. Sequence in context: A231809 A186969 A111950 * A243589 A178255 A154467 Adjacent sequences:  A274789 A274790 A274791 * A274793 A274794 A274795 KEYWORD nonn,more AUTHOR Natalia Makarova, Jul 07 2016 EXTENSIONS a(7)-a(8) from Dmitry Petukhov, Jul 07 2016 STATUS approved

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Last modified April 15 01:24 EDT 2021. Contains 342974 sequences. (Running on oeis4.)