A134795 Concatenation of first n positive oblong numbers.

2, 26, 2612, 261220, 26122030, 2612203042, 261220304256, 26122030425672, 2612203042567290, 2612203042567290110, 2612203042567290110132, 2612203042567290110132156, 2612203042567290110132156182

Offset: 1

Author

Omar E. Pol, Nov 26 2007

Keywords

• base
• easy
• nonn

Comments

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

Crossrefs

Cf. A007908, A132932. Oblong numbers: A002378.

Programs

Mathematica

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