id:A120353 - OEIS Search Results

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A120353

Sum of 5 consecutive powers of 3, starting with a power of 9..

+0
2

121, 1089, 9801, 88209, 793881, 7144929, 64304361, 578739249, 5208653241, 46877879169, 421900912521, 3797108212689, 34173973914201, 307565765227809, 2768091887050280, 24912826983452500, 224215442851073000 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Always a square.`
	LINKS	`Tanya Khovanova, Recursive Sequences`
	FORMULA	`a(n) = 121*3^(2n-2)`
	EXAMPLE	`a(2) = 3^2+3^3+3^4+3^5+3^6 = 121*(3^2) = 1089`
	CROSSREFS	`Adjacent sequences: A120350 A120351 A120352 this_sequence A120354 A120355 A120356` `Sequence in context: A048950 A020229 A141350 this_sequence A036928 A088171 A036308`
	KEYWORD	`nonn`
	AUTHOR	`Anton Joha (antonjoha(AT)hotmail.com), Jun 25 2006`

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Last modified October 12 11:54 EDT 2008. Contains 144829 sequences.

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