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 A110572 Numbers k such that the string 555k is prime. 0
 7, 11, 29, 41, 47, 79, 89, 109, 119, 143, 167, 209, 221, 251, 253, 257, 277, 287, 293, 301, 307, 337, 349, 361, 383, 391, 419, 421, 439, 461, 487, 491, 521, 523, 557, 589, 593, 637, 661, 671, 677, 683, 691, 697, 707, 739, 743, 761, 767, 823, 827, 829, 853 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..53. EXAMPLE For k=143, concatenating 555 and k gives 555143 (prime). MATHEMATICA Select[Range[853], PrimeQ[FromDigits[Join[{5, 5, 5}, IntegerDigits[#]]]]&] (* James C. McMahon, Apr 20 2024 *) CROSSREFS Sequence in context: A122560 A136338 A193867 * A023254 A129807 A045461 Adjacent sequences: A110569 A110570 A110571 * A110573 A110574 A110575 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Sep 12 2005 EXTENSIONS More terms from Vincenzo Librandi, Mar 27 2010 STATUS approved

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Last modified September 13 22:05 EDT 2024. Contains 375910 sequences. (Running on oeis4.)