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Search: id:A045507
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| A045507 |
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Concatenate powers of 2. |
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+0
2
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| 1, 12, 124, 1248, 124816, 12481632, 1248163264, 1248163264128, 1248163264128256, 1248163264128256512, 12481632641282565121024, 124816326412825651210242048, 1248163264128256512102420484096
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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A. Murthy, Smarandache Notions Journal, Vol. 11 N. 1-2-3 Spring 2000
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LINKS
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M. L. Perez et al., eds., Smarandache Notions Journal
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FORMULA
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a(n)=a(n-1)*10^(floor(1+log10(2^n)))+2^n, with a(0)=1 [From Paolo P. Lava (ppl(AT)spl.at), Oct 29 2008]
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EXAMPLE
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124 belongs to the sequence because it is the concatenation of 2^0, 2^1 and 2^2.
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MAPLE
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P:=proc(i) local a, n; a:=1; print(a); for n from 2 by 1 to i do a:=(a*10^trunc(evalf(floor(1+log10(2^n)), 100))+2^n); print(a); od; end: P(100); [From Paolo P. Lava (ppl(AT)spl.at), Oct 29 2008]
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CROSSREFS
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Sequence in context: A120918 A039680 A016134 this_sequence A155595 A070312 A153427
Adjacent sequences: A045504 A045505 A045506 this_sequence A045508 A045509 A045510
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KEYWORD
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nonn,base
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AUTHOR
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Jeff Burch (gburch(AT)erols.com)
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EXTENSIONS
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Murthy reference from Felice Russo (felice.russo(AT)katamail.com or felice.russo(AT)katamail.com - Nov 15 1999)
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