OFFSET
0,1
LINKS
FORMULA
(lcm_{k=1..n} (2^k - 1))/lcm_{k=1..n-1} (2^k - 1), n > 1. - Vladeta Jovovic, Jan 20 2002
Let b(1) = 1 and b(n+1) = lcm(b(n), 2^n-1) then Phi(n,2) = b(n+1)/b(n) = a(n). - Thomas Ordowski, May 08 2013
a(0) = 2; for n > 0, a(n) = (2^n-1)/gcd(a(0)*a(1)*...*a(n-1), 2^n-1). - Thomas Ordowski, May 11 2013
MAPLE
with(numtheory, cyclotomic); f := n->subs(x=2, cyclotomic(n, x)); seq(f(i), i=0..64);
MATHEMATICA
Join[{2}, Table[Cyclotomic[n, 2], {n, 1, 40}]] (* Jean-François Alcover, Jun 14 2013 *)
PROG
(PARI) vector(20, n, polcyclo(n, 2)) \\ Charles R Greathouse IV, May 18 2011
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved