id:A063577 - OEIS Search Results

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Smallest power of 4 having just n 2's in its decimal representation.

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1, 4, 9, 25, 36, 54, 45, 56, 68, 106, 87, 98, 100, 203, 140, 154, 160, 174, 165, 263, 246, 243, 157, 234, 276, 280, 338, 308, 343, 371, 335, 299, 427, 394, 497, 475, 473, 405, 524, 467, 577, 485, 586, 509, 492, 644, 464, 677, 563, 616, 582 (list; graph; listen)

	OFFSET	`0,2`
	MATHEMATICA	`a = {}; Do[k = 1; While[ Count[ IntegerDigits[4^k], 2] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a`
	CROSSREFS	`Sequence in context: A153158 A111245 A062503 this_sequence A087058 A046659 A063760` `Adjacent sequences: A063574 A063575 A063576 this_sequence A063578 A063579 A063580`
	KEYWORD	`base,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 10 2001`

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.

AT&T Labs Research