id:A129784 - OEIS Search Results

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Floor(log_10(2^(2^n))).

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0, 1, 2, 4, 9, 19, 38, 77, 154, 308, 616, 1233, 2466, 4932, 9864, 19728, 39456, 78913, 157826, 315652, 631305, 1262611, 2525222, 5050445, 10100890, 20201781, 40403562, 80807124, 161614248, 323228496, 646456993, 1292913986, 2585827972 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Starting with 2, n successive squarings yields an (a(n)+1)-digit number.`
	EXAMPLE	`a(16) = 19728 because floor(Log10(2^(2^16))) = floor(Log10(2^65536)) = floor(Log10(2.003529930406846*10^19728)) = floor(19728.30179583467) = 19728`
	CROSSREFS	`Sequence in context: A032175 A000678 A081490 this_sequence A125050 A056186 A054135` `Adjacent sequences: A129781 A129782 A129783 this_sequence A129785 A129786 A129787`
	KEYWORD	`nonn`
	AUTHOR	`Jon E. Schoenfield (jonscho(AT)hiwaay.net), May 18 2007`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

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