id:A050493 - OEIS Search Results

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Sum of binary digits of triangular numbers.

+0
1

0, 1, 2, 2, 2, 4, 3, 3, 2, 4, 5, 2, 4, 5, 4, 4, 2, 4, 5, 6, 4, 6, 7, 3, 4, 4, 7, 6, 5, 6, 5, 5, 2, 4, 5, 6, 5, 8, 6, 4, 5, 7, 6, 6, 8, 4, 5, 4, 4, 5, 8, 6, 5, 7, 7, 3, 6, 7, 8, 7, 6, 7, 6, 6, 2, 4, 5, 6, 5, 8, 7, 8, 4, 6, 8, 5, 8, 9, 4, 5, 5, 8, 7, 8, 8, 7, 8, 8, 7, 8, 12, 5, 6, 5, 6, 5, 4, 5, 8, 7, 8 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`T. D. Noe, Table of n, a(n) for n=0..1024`
	FORMULA	`a(n)=sum([c(n)/b^(i-1)]-[c(n)/b^i]*b, i=1..[log_b(c(n))]+1), b=2, n >= 1, a(0)=0, c(n)=A000217(n)`
	CROSSREFS	`A000217, A004157.` `Sequence in context: A054709 A121806 A056944 this_sequence A085454 A083403 A114091` `Adjacent sequences: A050490 A050491 A050492 this_sequence A050494 A050495 A050496`
	KEYWORD	`base,easy,nice,nonn`
	AUTHOR	`Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 27 1999`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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