id:A088116 - OEIS Search Results

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Let n = abc..., where a, b, c, are digits of n. a(n) = a*bc...+b*ac...+c*ab...+..., i.e. a(n) = sum, over all the digits, of the product (number obtained by deleting a digit multiplied by the deleted digit).

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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 0, 6, 12, 18, 24, 30, 36, 42, 48, 54, 0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 0, 14, 28, 42, 56, 70, 84, 98 (list; graph; listen)

	OFFSET	`1,12`
	COMMENT	`First 100 terms ( for all two digit numbers) match with that of A069816. a(10a + b) = 2ab = (a+b)^2 - (a^2+b^2)= A069816(10a +b).`
	EXAMPLE	`a(1234) = 234 + 2134 + 3124 + 4*123 = 1366.`
	CROSSREFS	`Cf. A069816, A088117.` `Cf. A087346.` `Sequence in context: A076428 A055958 A069816 this_sequence A100817 A074157 A076309` `Adjacent sequences: A088113 A088114 A088115 this_sequence A088117 A088118 A088119`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 25 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 10 2005`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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