id:A071423 - OEIS Search Results

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a(n) = a(n-1) + number of decimal digits of 2^n. Number of decimal digits of concatenation of first n powers of 2.

+0
1

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	OFFSET	`1,2`
	FORMULA	`a(n) = a(n-1)+A034887(n). [R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 11 2009]`
	MATHEMATICA	`Do[s=s+Length[IntegerDigits[2^n]]; Print[s], {n, 1, 128}]`
	CROSSREFS	`Cf. A058183.` `Sequence in context: A036963 A120431 A024195 this_sequence A062781 A145919 A058937` `Adjacent sequences: A071420 A071421 A071422 this_sequence A071424 A071425 A071426`
	KEYWORD	`easy,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), May 27 2002`
	EXTENSIONS	`An incorrect g.f. was deleted by N. J. A. Sloane, Sep 13 2009`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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