id:A063611 - OEIS Search Results

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Smallest power of 7 having just n 5's in its decimal representation.

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1, 7, 15, 27, 21, 49, 55, 47, 51, 87, 85, 107, 75, 99, 61, 149, 138, 133, 171, 135, 165, 237, 209, 197, 269, 221, 232, 219, 277, 248, 258, 306, 271, 264, 357, 296, 310, 347, 354, 260, 342, 374, 407, 425, 362, 457, 485, 480, 486, 488, 492 (list; graph; listen)

	OFFSET	`0,2`
	MATHEMATICA	`a = {}; Do[k = 1; While[ Count[ IntegerDigits[7^k], 5] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a`
	CROSSREFS	`Sequence in context: A082111 A154935 A012480 this_sequence A146624 A006188 A139597` `Adjacent sequences: A063608 A063609 A063610 this_sequence A063612 A063613 A063614`
	KEYWORD	`base,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 10 2001`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

AT&T Labs Research