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 A118373 Product of decimal digits of two successive natural numbers. 0
 0, 2, 6, 12, 20, 30, 42, 56, 72, 0, 0, 2, 6, 12, 20, 30, 42, 56, 72, 0, 0, 8, 24, 48, 80, 120, 168, 224, 288, 0, 0, 18, 54, 108, 180, 270, 378, 504, 648, 0, 0, 32, 96, 192, 320, 480, 672, 896, 1152, 0, 0, 50, 150, 300, 500, 750, 1050, 1400, 1800, 0, 0, 72, 216, 432, 720 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS All numbers of the form n(n+1)*k^2, with n>0, are in the sequence. LINKS Table of n, a(n) for n=1..65. MATHEMATICA Times@@Flatten[IntegerDigits/@#]&/@Partition[Range[0, 70], 2, 1] (* Harvey P. Dale, Apr 22 2018 *) CROSSREFS Cf. A002378. Sequence in context: A034100 A034110 A298010 * A077252 A102069 A160938 Adjacent sequences: A118370 A118371 A118372 * A118374 A118375 A118376 KEYWORD base,easy,nonn AUTHOR Giovanni Teofilatto, May 15 2006 STATUS approved

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Last modified May 19 06:35 EDT 2024. Contains 372666 sequences. (Running on oeis4.)