id:A131615 - OEIS Search Results

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

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

	OFFSET	`1,2`
	COMMENT	`I conjecture that 101 is the last term.`
	MATHEMATICA	`Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 7] &]`
	CROSSREFS	`Cf. A007377.` `Sequence in context: A035231 A035259 A047614 this_sequence A087815 A022549 A045704` `Adjacent sequences: A131612 A131613 A131614 this_sequence A131616 A131617 A131618`
	KEYWORD	`base,fini,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Sep 01 2007`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.