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A118373 Product of decimal digits of two successive natural numbers. 0

%I #4 Apr 22 2018 16:22:55

%S 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,

%T 168,224,288,0,0,18,54,108,180,270,378,504,648,0,0,32,96,192,320,480,

%U 672,896,1152,0,0,50,150,300,500,750,1050,1400,1800,0,0,72,216,432,720

%N Product of decimal digits of two successive natural numbers.

%C All numbers of the form n(n+1)*k^2, with n>0, are in the sequence.

%t Times@@Flatten[IntegerDigits/@#]&/@Partition[Range[0,70],2,1] (* _Harvey P. Dale_, Apr 22 2018 *)

%Y Cf. A002378.

%K base,easy,nonn

%O 1,2

%A _Giovanni Teofilatto_, May 15 2006

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Last modified June 22 22:39 EDT 2024. Contains 373623 sequences. (Running on oeis4.)