id:A126206 - OEIS Search Results

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Number of 4's in decimal expansion of 4^n.

+0
7

0, 1, 0, 1, 0, 1, 1, 1, 0, 2, 1, 3, 0, 1, 2, 2, 2, 1, 1, 3, 0, 3, 3, 3, 2, 2, 2, 3, 1, 2, 2, 3, 4, 3, 1, 3, 3, 4, 2, 4, 2, 4, 2, 2, 3, 4, 3, 3, 3, 3, 2, 2, 3, 5, 2, 4, 2, 4, 4, 3, 3, 3, 4, 4, 6, 5, 5, 4, 2, 9, 5, 2, 4, 6, 4, 7, 4, 2, 5, 4, 3, 4, 8, 4, 7, 9, 2, 8, 4, 7, 3, 10, 9, 5, 3, 5, 8, 8, 3, 10, 4 (list; graph; listen)

	OFFSET	`0,10`
	EXAMPLE	`a(11)=3 because 4^11=4194304 with three 4's.`
	MAPLE	`P:=proc(n) local i, k, x, y, w, cont; y:=4; k:=y; for i from 0 by 1 to n do x:=y^i; cont:=0; while x>0 do w:=x-trunc(x/10)*10; if w=k then cont:=cont+1; fi; x:=trunc(x/10); od; print(cont); od; end: P(100);`
	CROSSREFS	`Cf. A065710, A126205, A126207, A126208, A126209, A126210, A126211.` `Sequence in context: A071431 A140699 A140256 this_sequence A119709 A120251 A071490` `Adjacent sequences: A126203 A126204 A126205 this_sequence A126207 A126208 A126209`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Dec 20 2006`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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