A131616 Numbers k such that the decimal expansion of 3^k contains no 6.

0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 15, 18, 23, 32, 35, 42, 55, 104

Offset

1,3

Comments

I conjecture that 104 is the last term.

Links

Table of n, a(n) for n=1..20.

Mathematica

Join[{0}, Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 6] &]

Prog

(Magma) [n: n in [0..1000] | not 6 in Intseq(3^n) ]; // Vincenzo Librandi, May 06 2015

Crossrefs

Cf. similar sequences listed in A131613.

Cf. A007377.

Sequence in context: A050687 A098908 A097296 * A175857 A173919 A205666

Adjacent sequences: A131613 A131614 A131615 * A131617 A131618 A131619

Keyword

base,fini,nonn

Author

Shyam Sunder Gupta, Sep 01 2007

Extensions

Initial 0 added and Mathematica code adapted by Vincenzo Librandi, May 06 2015

Status

approved