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 A108257 Numbers n such that concatenating n and the sum of factorials of the digits of n produces a prime. 0
 1, 13, 15, 30, 31, 91, 101, 110, 128, 133, 136, 138, 144, 152, 156, 166, 175, 193, 199, 203, 215, 230, 250, 260, 280, 281, 303, 304, 306, 307, 309, 315, 320, 330, 331, 340, 361, 391, 412, 508, 520, 550, 606, 651, 661, 681, 708, 712, 717, 730, 750, 751, 780 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The largest prime I have found pertaining to this sequence is A109016(Fibonacci(9837)) with 2064 digits (not proved prime, only Fermat and Lucas PRP). LINKS EXAMPLE 193 is in the sequence because 1!+9!+3! = 362887 and 193362887 is prime. CROSSREFS Cf. A061602, A109016. Sequence in context: A087814 A227449 A113801 * A217252 A299593 A318543 Adjacent sequences:  A108254 A108255 A108256 * A108258 A108259 A108260 KEYWORD base,nonn AUTHOR Jason Earls, Jun 18 2005 STATUS approved

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Last modified June 30 19:43 EDT 2022. Contains 354945 sequences. (Running on oeis4.)