id:A001539 - OEIS Search Results

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(4n+1)(4n+3).

+0
9

3, 35, 99, 195, 323, 483, 675, 899, 1155, 1443, 1763, 2115, 2499, 2915, 3363, 3843, 4355, 4899, 5475, 6083, 6723, 7395, 8099, 8835, 9603, 10403, 11235, 12099, 12995, 13923, 14883, 15875, 16899, 17955 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Sequence arises from reading the line from 3, in the direction 3, 35,... in the square spiral whose vertices are the squares A000290. - Omar E. Pol (info(AT)polprimos.com), May 24 2008`
	FORMULA	`Sum(k>=0, 1/a(k)) = Pi/8 - Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 20 2002`
	CROSSREFS	`a(n) = A016826(n) - 1 = [A001533(n)+5]/4 = [A001538(n)+16]/9. Bisection of A000466.` `Cf. A000290, A016286.` `Sequence in context: A054783 A102104 A054287 this_sequence A113854 A076376 A133710` `Adjacent sequences: A001536 A001537 A001538 this_sequence A001540 A001541 A001542`
	KEYWORD	`nonn,easy`
	AUTHOR	`njas`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research