id:A055260 - OEIS Search Results

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Sums of two powers of 9.

+0
1

2, 10, 18, 82, 90, 162, 730, 738, 810, 1458, 6562, 6570, 6642, 7290, 13122, 59050, 59058, 59130, 59778, 65610, 118098, 531442, 531450, 531522, 532170, 538002, 590490, 1062882, 4782970, 4782978, 4783050, 4783698, 4789530, 4842018 (list; table; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n) = 9^(n-trinv(n))+9^trinv(n), where trinv(n) = floor((1+sqrt(1+8*n))/2) = A002262(n) and n-trinv(n) = A003056(n)` `Regarded as a triangle T(n, k)=9^n+9^k, so as a sequence a(n) =9^A002262(n)+9^A003056(n).`
	EXAMPLE	`a(4) = 90 = 9^2+9^1`
	CROSSREFS	`Cf. A052216.` `Sequence in context: A018227 A092062 A134251 this_sequence A156446 A032685 A085936` `Adjacent sequences: A055257 A055258 A055259 this_sequence A055261 A055262 A055263`
	KEYWORD	`base,easy,nonn,tabl`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jun 22 2000`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

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