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Concatenation of first n positive oblong numbers.
0

%I #4 Sep 06 2015 16:23:23

%S 2,26,2612,261220,26122030,2612203042,261220304256,26122030425672,

%T 2612203042567290,2612203042567290110,2612203042567290110132,

%U 2612203042567290110132156,2612203042567290110132156182

%N Concatenation of first n positive oblong numbers.

%C Oblong numbers are also called promic, pronic or heteromecic (numbers).

%t Module[{nn=20,c},c=2*Accumulate[Range[nn]];Table[FromDigits[ Flatten[ IntegerDigits/@ Take[c,n]]],{n,nn}]] (* _Harvey P. Dale_, Sep 06 2015 *)

%Y Cf. A007908, A132932. Oblong numbers: A002378.

%K base,easy,nonn

%O 1,1

%A _Omar E. Pol_, Nov 26 2007