id:A046181 - OEIS Search Results

Search: id:A046181

Displaying 1-1 of 1 results found.

page 1

Indices of octagonal numbers which are also triangular.

+0
3

1, 3, 63, 261, 6141, 25543, 601723, 2502921, 58962681, 245260683, 5777740983, 24033043981, 566159653621, 2354993049423, 55477868313843, 230765285799441, 5436264935102961, 22612643015295763 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	FORMULA	`For n odd, a(n+2)=98a(n+1)-a(n)-32; for n even, a(n+1)=49a(n)-16+10(24a(n)^2-16*a(n)+1)^0.5 - Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 2007, Oct 09 2007`
	CROSSREFS	`Cf. A046182, A046183.` `Cf. A046182 A046183.` `Adjacent sequences: A046178 A046179 A046180 this_sequence A046182 A046183 A046184` `Sequence in context: A087886 A123754 A048354 this_sequence A120053 A139293 A133275`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com)`
	EXTENSIONS	`More terms from Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 2007`

page 1

Search completed in 0.002 seconds

Last modified July 3 22:29 EDT 2009. Contains 160563 sequences.

AT&T Labs Research