id:A131617 - OEIS Search Results

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Numbers n such that decimal expansion of 3^n contains no 5.

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1, 2, 3, 4, 5, 6, 7, 9, 11, 14, 15, 16, 17, 18, 19, 20, 23, 25, 29, 31, 41, 44, 52, 58, 81, 91 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`I conjecture that 91 is the last term.`
	MATHEMATICA	`Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 5] &]`
	CROSSREFS	`Cf. A007377.` `Sequence in context: A011867 A026445 A030151 this_sequence A005577 A072966 A059759` `Adjacent sequences: A131614 A131615 A131616 this_sequence A131618 A131619 A131620`
	KEYWORD	`base,fini,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Sep 01 2007`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.