A258781 - OEIS

A258781

a(n) is the greatest positive integer k such that lambda(k) <= n where lambda is the Carmichael lambda function (A002322).

2, 24, 24, 240, 240, 504, 504, 504, 504, 504, 504, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 65520, 131040, 131040, 131040, 131040, 131040, 131040, 171864, 171864, 171864, 171864, 171864, 171864, 138181680, 138181680, 138181680

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..38.

Eric W. Weisstein's mathWorld, Carmichael Function

EXAMPLE

a(2)=24 because lambda(24) = 2 and 24 is the greatest number such that lambda(24) <= 2.

MAPLE

with(numtheory):

for n from 1 to 30 do:

ii:=0: