A111464 a(1) = 12, a(n+1) = lcm{a(n), Digit Reversal(a(n))}.

12, 84, 336, 70896, 1649679024, 2314922791895828688, 36399640682124013852413819710318544, 77273493636380731521261660069550949170528534841641864516576194470832

Offset

1,1

Comments

Next term has 135 digits.

Links

Table of n, a(n) for n=1..8.

Example

a(3) = lcm(84,48) = 336.

Maple

rev:=proc(n) local nn, nnn: nn:=convert(n, base, 10): add(nn[nops(nn)+1-j]*10^(j-1), j=1..nops(nn)) end: a[1]:=12: for n from 1 to 8 do a[n+1]:=lcm(a[n], rev(a[n])) od: seq(a[n], n=1..8); # Emeric Deutsch, Aug 11 2005

Mathematica

NestList[LCM[#, FromDigits[Reverse[IntegerDigits[#]]]]&, 12, 8]  (* Harvey P. Dale, Jan 09 2011 *)

Crossrefs

Sequence in context: A213784 A085409 A303916 * A341367 A004407 A054849

Adjacent sequences: A111461 A111462 A111463 * A111465 A111466 A111467

Keyword

base,nonn

Author

Amarnath Murthy, Aug 04 2005

Extensions

More terms from Emeric Deutsch, Aug 11 2005

Status

approved