id:A121759 - OEIS Search Results

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In decimal number system, take even digits of n with negative sign.

+0
3

1, -2, 3, -4, 5, -6, 7, -8, 9, 10, 11, 8, 13, 6, 15, 4, 17, 2, 19, -20, -19, -22, -17, -24, -15, -26, -13, -28, -11, 30, 31, 28, 33, 26, 35, 24, 37, 22, 39, -40, -39, -42, -37, -44, -35, -46, -33, -48, -31, 50, 51, 48, 53, 46, 55, 44, 57, 42, 59, -60, -59, -62, -57, -64, -55, -66, -53, -68, -51, 70, 71, 68, 73, 66, 75, 64, 77, 62 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`See A121758. In decimal number system, take odd digits of n with negative sign.` `a(A014261(n)) = A014261(n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 30 2007`
	FORMULA	`If n = d(i)10^(i-1), then a(n)=(-1)^(1+d(i))d(i)*10^(i-1). a(n)=-A121759(n)`
	EXAMPLE	`a(12)=8 because 12=110^1+210^0 and a(12)=(-1)^(1+1)110^1+(-1)^(1+2)210^0=10-2=8.`
	CROSSREFS	`Cf. A121758.` `Sequence in context: A043271 A062759 A121758 this_sequence A072778 A034326 A053833` `Adjacent sequences: A121756 A121757 A121758 this_sequence A121760 A121761 A121762`
	KEYWORD	`base,sign,nice`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Aug 20 2006`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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