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 A259391 Numbers n such that A258881(n+k) is prime for k=0,...,9; where A258881(x) = x + sum of the square of the digits of x (A003132). 2
 10, 1761702690, 7226006660, 16453361570, 95748657190, 104217487100, 111058349320, 141665059420, 168759510430, 177313689280, 177313689330, 178209124090, 188343072120, 347296044930, 347296045010, 381449093790, 381449093840, 445151776780, 491570264380 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Terms computed by G. Resta, cf. link to Prime Puzzle 776. LINKS C. Riviera, Puzzle 776. Ten consecutive integers such that..., PrimePuzzles.net, March 2015. EXAMPLE For n = 10, A258881(10) = 10 + 1^2 + 0^2 = 11, A258881(11) = 11 + 1^2 + 1^2 = 13, A258881(12) = 12 + 1^2 + 2^2 = 17, ..., A258881(19) = 19 + 1^2 + 9^2 = 101 are all prime, therefore a(1) = 10. The next value of 10 in A259567 occurs at index n = 1761702690 = a(2). CROSSREFS Cf. A003132, A258881, A259567. Sequence in context: A057141 A034249 A131679 * A279540 A321538 A321803 Adjacent sequences:  A259388 A259389 A259390 * A259392 A259393 A259394 KEYWORD nonn,base AUTHOR M. F. Hasler, Jul 19 2015 STATUS approved

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Last modified August 18 08:57 EDT 2019. Contains 326077 sequences. (Running on oeis4.)