%I #7 Aug 13 2022 12:57:18
%S 1,2,34,
%T 35363738394041424344454647484950515253545556575859606162636465666768
%N Concatenate the next a(n) integers to get the n+1 term.
%F a(n+1) = (a(n)+1).(a(n)+2). ... .(a(n)+a(n))
%t NestList[FromDigits[Flatten[IntegerDigits/@Range[#+1,2#]]]&,1,3] (* _Harvey P. Dale_, Aug 13 2022 *)
%K base,easy,nonn
%O 0,2
%A _Dann Toliver_