A131615 - OEIS

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A131615

Numbers n such that decimal expansion of 3^n contains no 7.

1, 2, 4, 5, 8, 9, 10, 12, 13, 17, 21, 22, 24, 26, 30, 32, 33, 36, 42, 46, 66, 101 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`I conjecture that 101 is the last term.`
	MATHEMATICA	`Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 7] &]`
	CROSSREFS	`Cf. A007377.` `Sequence in context: A035259 A047614 A189625 * A166110 A087815 A022549` `Adjacent sequences: A131612 A131613 A131614 * A131616 A131617 A131618`
	KEYWORD	`base,fini,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Sep 01 2007`

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.