id:A121760 - OEIS Search Results

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

+0
2

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; listen)

	OFFSET	`1,2`
	COMMENT	`See accompanying sequence A121761 In decimal number system, take negative power of 10 at even 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(12)=21 because 12=110^1+210^0 and a(12)=numerator[110^((-1)^(1)1)+210^((-1)^(0)0)=1/10+2=21/10]=21.`
	CROSSREFS	`Cf. A121761.` `Sequence in context: A107603 A084011 A004086 this_sequence A061816 A083960 A138795` `Adjacent sequences: A121757 A121758 A121759 this_sequence A121761 A121762 A121763`
	KEYWORD	`base,frac,nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Aug 20 2006`
	EXTENSIONS	`a(40) corrected by njas, Aug 23 2006`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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