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A121760
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In decimal number system, take negative power of 10 at odd digits of n. Sequence gives numerators of result.
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2
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1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 11, 21, 31, 41, 51, 61, 71, 81, 91, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 3, 13, 23, 33, 43, 53, 63, 73, 83, 93, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 7, 17, 27, 37, 47, 57, 67
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| See accompanying sequence A121761 In decimal number system, take negative power of 10 at even digits of n.
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LINKS
| Zak Seidov, First 1000 terms
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FORMULA
| If n = sum(d(i)*10^(i-1)), then a(n)=sum(d(i)*10^((-1)^(1+d(i))*(i-1))).
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EXAMPLE
| a(12)=21 because 12=1*10^1+2*10^0 and a(12)=numerator[1*10^((-1)^(1)*1)+2*10^((-1)^(0)*0)=1/10+2=21/10]=21.
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CROSSREFS
| Cf. A121761.
Sequence in context: A161594 A084011 A004086 * A061816 A083960 A138795
Adjacent sequences: A121757 A121758 A121759 * A121761 A121762 A121763
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KEYWORD
| base,frac,nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Aug 20 2006
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EXTENSIONS
| a(40) corrected by N. J. A. Sloane (njas(AT)research.att.com), Aug 23 2006
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