A041012 Concatenate the next a(n) integers to get the n+1 term.

1, 2, 34, 35363738394041424344454647484950515253545556575859606162636465666768

Offset: 0

Author

Dann Toliver

Keywords

• base
• easy
• nonn

Programs

Mathematica

NestList[FromDigits[Flatten[IntegerDigits/@Range[#+1,2#]]]&,1,3] (* Harvey P. Dale, Aug 13 2022 *)

Formula

a(n+1) = (a(n)+1).(a(n)+2). ... .(a(n)+a(n))