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 A131613 Numbers n such that decimal expansion of 3^n contains no 9. 8
 0, 1, 3, 4, 5, 7, 8, 11, 12, 16, 19, 20, 21, 29, 32, 56 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS I conjecture that 56 is the last term. LINKS MATHEMATICA Join[{0}, Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 9] &] PROG (MAGMA) [n: n in [0..1000] | not 9 in Intseq(3^n) ]; // Vincenzo Librandi, May 06 2015 CROSSREFS Numbers n such that decimal expansion of 3^n contains no k: A030700 (k=0), A131627 (k=1), A131625 (k=2), A131629 (k=3), A131618 (k=4), A131617 (k=5), A131616 (k=6), A131615 (k=7), A131614 (k=8), this sequence (k=9). Cf. A007377. Sequence in context: A173001 A047500 A257408 * A138494 A285531 A111801 Adjacent sequences:  A131610 A131611 A131612 * A131614 A131615 A131616 KEYWORD base,fini,nonn AUTHOR Shyam Sunder Gupta, Sep 01 2007 EXTENSIONS Adapted Mma and initial 0 added by Vincenzo Librandi, May 06 2015 STATUS approved

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Last modified March 24 06:56 EDT 2019. Contains 321444 sequences. (Running on oeis4.)