id:A121761 - OEIS Search Results

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In decimal number system, take negative power of 10 at even digits of n. Sequence gives numerators of result.

+0
2

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; listen)

	OFFSET	`1,2`
	COMMENT	`See accompanying sequence A121760 In decimal number system, take negative power of 10 at odd digits of n.`
	LINKS	`Zak Seidov, First 1000 terms`
	FORMULA	`If n=sum(d(i)10^(i-1)), then a(n)=sum(d(i)10^((-1)^(1+d(i))*(i-1)))`
	EXAMPLE	`a(23)=16 because 23=210^1+310^0 and a(23)=numerator[210^((-1)^(1+2)1)+310^((-1)^(1+3)0)=2/10+3=32/10=16/5]=16.`
	CROSSREFS	`Cf. A121760.` `Adjacent sequences: A121758 A121759 A121760 this_sequence A121762 A121763 A121764` `Sequence in context: A106620 A080685 A074805 this_sequence A056963 A107602 A090322`
	KEYWORD	`base,frac,nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Aug 20 2006`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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