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A121761
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In decimal number system, take negative power of 10 at even 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, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 70, 71, 72, 73, 74, 75
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| See accompanying sequence A121760 In decimal number system, take negative power of 10 at odd 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(23)=16 because 23=2*10^1+3*10^0 and a(23)=numerator[2*10^((-1)^(1+2)*1)+3*10^((-1)^(1+3)*0)=2/10+3=32/10=16/5]=16.
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CROSSREFS
| Cf. A121760.
Sequence in context: A106620 A080685 A074805 * A056963 A167129 A107602
Adjacent sequences: A121758 A121759 A121760 * A121762 A121763 A121764
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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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