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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). 3
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
Sequence in context: A034249 A358815 A131679 * A279540 A321538 A321803
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Jul 19 2015
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)