id:A121758 - OEIS Search Results

Search: id:A121758

Displaying 1-1 of 1 results found.

page 1

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

+0
2

-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 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`See A121759. In decimal number system, take even digits of n with negative sign.`
	FORMULA	`If n = d(i)10^(i-1), then a(n)=(-1)^d(i)d(i)*10^(i-1).`
	EXAMPLE	`a(12)=-8 because 12=110^1+210^0 and a(12)=(-1)^1110^1+(-1)^2210^0=-10+2=-8.`
	CROSSREFS	`Cf. A121759.` `Sequence in context: A056961 A043271 A062759 this_sequence A121759 A072778 A034326` `Adjacent sequences: A121755 A121756 A121757 this_sequence A121759 A121760 A121761`
	KEYWORD	`base,sign,nice`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Aug 20 2006`

page 1

Search completed in 0.002 seconds

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research