id:A067552 - OEIS Search Results

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SumOfDigits(n)^2 - SumOfDigits(n^2), where SumOfDigits = A007953.

+0
4

0, 0, 0, 0, 9, 18, 27, 36, 54, 72, 0, 0, 0, 0, 9, 27, 36, 45, 72, 90, 0, 0, 0, 9, 18, 36, 45, 63, 81, 108, 0, 0, 18, 18, 36, 54, 63, 81, 108, 135, 9, 9, 18, 27, 45, 72, 90, 108, 135, 162, 18, 27, 36, 45, 63, 90, 108, 126, 153, 180, 27, 36, 45, 54, 81, 108, 126, 144, 180, 207 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`a(n) = A007953(n)^2 - A004159(n).`
	EXAMPLE	`a(16) = SumOfDigits(16)^2 - SumOfDigits(16^2) = (1+6)^2 - SumOfDigits(256) = 7^2 - (2+5+6) = 49 - 13 = 36.`
	MATHEMATICA	`f[n_] := Plus @@ IntegerDigits[n]^2 - Plus @@ (IntegerDigits[n^2]); Table[ f[n], {n, 0, 100}]`
	CROSSREFS	`Cf. A061909.` `Sequence in context: A033006 A118468 A083497 this_sequence A052489 A115552 A043322` `Adjacent sequences: A067549 A067550 A067551 this_sequence A067553 A067554 A067555`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 28, 2002`
	EXTENSIONS	`Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), May 04 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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