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A131618 Numbers n such that decimal expansion of 3^n contains no 4. 1
0, 1, 2, 3, 4, 6, 7, 8, 9, 22, 33, 34, 38, 46, 49, 75, 106 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

I conjecture that 106 is the last term.

LINKS

Table of n, a(n) for n=1..17.

MATHEMATICA

Join[{0}, Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 4] &]

PROG

(MAGMA) [n: n in [0..1000] | not 4 in Intseq(3^n)]; // Vincenzo Librandi, May 06 2015

CROSSREFS

Cf. similar sequences listed in A131613.

Cf. A007377.

Sequence in context: A036796 A209643 A039123 * A144111 A039257 A039198

Adjacent sequences:  A131615 A131616 A131617 * A131619 A131620 A131621

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

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Last modified April 25 13:31 EDT 2019. Contains 322461 sequences. (Running on oeis4.)