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 A088116 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). 2
 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; refs; listen; history; text; internal format)
 OFFSET 1,12 COMMENTS 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). LINKS EXAMPLE a(1234) = 234 + 2*134 + 3*124 + 4*123 = 1366. CROSSREFS Cf. A069816, A088117. Cf. A087346. Sequence in context: A241142 A271907 A069816 * A100817 A074157 A076309 Adjacent sequences:  A088113 A088114 A088115 * A088117 A088118 A088119 KEYWORD base,easy,nonn AUTHOR Amarnath Murthy, Sep 25 2003 EXTENSIONS More terms from David Wasserman, May 10 2005 STATUS approved

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Last modified July 23 04:00 EDT 2019. Contains 325230 sequences. (Running on oeis4.)