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A129784
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Floor(log_10(2^(2^n))).
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0
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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; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Starting with 2, n successive squarings yields an (a(n)+1)-digit number.
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EXAMPLE
| a(16) = 19728 because floor(Log10(2^(2^16))) = floor(Log10(2^65536)) = floor(Log10(2.003529930406846*10^19728)) = floor(19728.30179583467) = 19728
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CROSSREFS
| Sequence in context: A032175 A000678 A081490 * A125050 A056186 A054135
Adjacent sequences: A129781 A129782 A129783 * A129785 A129786 A129787
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KEYWORD
| nonn
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AUTHOR
| Jon E. Schoenfield (jonscho(AT)hiwaay.net), May 18 2007
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