A131613 - OEIS

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A131613

Numbers n such that decimal expansion of 3^n contains no 9.

1, 3, 4, 5, 7, 8, 11, 12, 16, 19, 20, 21, 29, 32, 56 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`I conjecture that 56 is the last term.`
	MATHEMATICA	`Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 9] &]`
	CROSSREFS	`Cf. A007377.` `Sequence in context: A137292 A173001 A047500 * A138494 A111801 A108372` `Adjacent sequences: A131610 A131611 A131612 * A131614 A131615 A131616`
	KEYWORD	`base,fini,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Sep 01 2007`

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Last modified February 14 13:08 EST 2012. Contains 205623 sequences.