id:A055257 - OEIS Search Results

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Sums of two powers of 6.

+0
1

2, 7, 12, 37, 42, 72, 217, 222, 252, 432, 1297, 1302, 1332, 1512, 2592, 7777, 7782, 7812, 7992, 9072, 15552, 46657, 46662, 46692, 46872, 47952, 54432, 93312, 279937, 279942, 279972, 280152, 281232, 287712, 326592, 559872, 1679617, 1679622 (list; table; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n) = 6^(n-trinv(n))+6^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)=6^n+6^k, so as a sequence a(n) =6^A002262(n)+6^A003056(n).`
	EXAMPLE	`a(4) = 42 = 6^2+6^1`
	CROSSREFS	`Cf. A052216.` `Sequence in context: A088662 A073710 A092831 this_sequence A084068 A046243 A103886` `Adjacent sequences: A055254 A055255 A055256 this_sequence A055258 A055259 A055260`
	KEYWORD	`base,easy,nonn,tabl`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jun 22 2000`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research