login
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
OFFSET
1,2
COMMENTS
All numbers of the form n(n+1)*k^2, with n>0, are in the sequence.
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
KEYWORD
base,easy,nonn
AUTHOR
Giovanni Teofilatto, May 15 2006
STATUS
approved