id:A063608 - OEIS Search Results

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Smallest power of 7 having just n 2's in its decimal representation.

+0
1

1, 4, 12, 10, 20, 32, 30, 68, 49, 73, 82, 93, 125, 103, 109, 131, 146, 119, 161, 113, 172, 163, 191, 197, 199, 240, 232, 243, 210, 217, 288, 317, 292, 289, 321, 333, 319, 327, 276, 374, 358, 397, 354, 357, 373, 452, 428, 489, 391, 516, 470 (list; graph; listen)

	OFFSET	`0,2`
	MATHEMATICA	`a = {}; Do[k = 1; While[ Count[ IntegerDigits[7^k], 2] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a`
	CROSSREFS	`Sequence in context: A145046 A084415 A156681 this_sequence A074258 A120213 A005886` `Adjacent sequences: A063605 A063606 A063607 this_sequence A063609 A063610 A063611`
	KEYWORD	`base,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 10 2001`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research