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 A286661 Primes of form A038396(n) - 1 or A038396(n) + 1. 0
 3, 41, 43, 641, 643, 8641, 108643, 18161412108641, 525048464442403836343230282624222018161412108643, 646260585654525048464442403836343230282624222018161412108641 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(11) = A038396(42) + 1 = 84...43, a(12) = A038396(54) + 1 = 108...43; a(13) = A038396(185) + 1 = 370...43, a(14) = A038396(199) - 1 = 398...41; a(15) = A038396(224) + 1 = 448...43, a(16) = A038396(248) - 1 = 496...41; a(17) = A038396(346) - 1 = 692...41, a(18) = A038396(947) - 1 = 1894...41. a(19) (if it exists) will be more than  A038396(3000). a(2) and a(3) are a pair of twin primes, a(4) and a(5) also. LINKS Eric Weisstein's World of Mathematics, Consecutive Number Sequences MATHEMATICA Select[#, PrimeQ] &@ Flatten@ Table[{# - 1, # + 1} &@ FromDigits@ Flatten@ Reverse@ Take[#, n], {n, Length@ #}] &@ Array[IntegerDigits[2 #] &, 40] (* Michael De Vlieger, May 14 2017 *) CROSSREFS Cf. A038396, A019520, A210734. Sequence in context: A110468 A327356 A295612 * A171058 A105906 A157009 Adjacent sequences:  A286658 A286659 A286660 * A286662 A286663 A286664 KEYWORD nonn,base AUTHOR XU Pingya, May 12 2017 STATUS approved

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Last modified September 27 10:35 EDT 2020. Contains 337380 sequences. (Running on oeis4.)