A131627 Numbers k such that the decimal expansion of 3^k contains no 1.

1, 2, 3, 5, 6, 10, 14, 18, 25, 27, 29, 33, 37, 43

Offset: 1

Author

Shyam Sunder Gupta, Sep 01 2007

Keywords

• base
• fini
• nonn

Comments

I conjecture that 43 is the last term.

Crossrefs

Cf. similar sequences listed in A131613.

Cf. A007377.

Programs

Magma

[n: n in [0..1000] | not 1 in Intseq(3^n) ]; // Vincenzo Librandi, May 06 2015

Mathematica

Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 1] &]