A109935 Least common multiple of the digit reversals of the first n natural numbers.

1, 2, 6, 12, 60, 60, 420, 840, 2520, 2520, 27720, 27720, 859320, 35232120, 598946040, 36535708440, 2594035299240, 23346317693160, 303502130011080, 303502130011080, 303502130011080, 303502130011080, 1214008520044320, 1214008520044320, 1214008520044320

Offset

1,2

Comments

a(1) to a(12) are the same as in A003418.

Links

Table of n, a(n) for n=1..25.

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:=n->lcm(seq(rev(j), j=1..n)): seq(a(n), n=1..27); # Emeric Deutsch, Aug 03 2005

Prog

(PARI) r(n) = fromdigits(Vecrev(digits(n))); \\ A004086
a(n) = lcm(Vec(apply(x->r(x), vector(n, i, i))); \\ Michel Marcus, Aug 15 2019

Crossrefs

Cf. A003418, A004086.

Sequence in context: A211418 A058312 A003418 * A347304 A065887 A072181

Adjacent sequences: A109932 A109933 A109934 * A109936 A109937 A109938

Keyword

base,nonn

Author

Amarnath Murthy, Jul 19 2005

Extensions

Corrected and extended by Emeric Deutsch and Erich Friedman, Aug 03 2005

Status

approved