id:A037582 - OEIS Search Results

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Base 10 digits are, in order, the first n terms of the periodic sequence with initial period 1,3.

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1

1, 13, 131, 1313, 13131, 131313, 1313131, 13131313, 131313131, 1313131313, 13131313131, 131313131313, 1313131313131, 13131313131313, 131313131313131, 1313131313131313 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=10a(n-1)+2+(-1)^n, with a(0)=0. Closed form: a(n)=-(2/9)+(1/11)(-1)^n+(13/99)*10^n, with n>=1 [From Paolo P. Lava (ppl(AT)spl.at), Jul 30 2009]`
	CROSSREFS	`Sequence in context: A037603 A037708 A142740 this_sequence A065539 A048554 A161498` `Adjacent sequences: A037579 A037580 A037581 this_sequence A037583 A037584 A037585`
	KEYWORD	`nonn,base`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.

AT&T Labs Research