

A096996


a(n) is the smallest initial value if function f(x)=sigma(phi(x))=A062402(x) is iterated and the iteration ends in a cycle of length n.


1




OFFSET

1,2


COMMENTS

a(5) exists and <= 2^80.
a(6) = 883, a(11) = 88897, a(15) = 470137, a(18) = 448181;
a(9) = 24877841, a(12) = 16295171, a(21) <= 726569551. 254808457 does not reach a cycle after 14000 iterations.  Hiroaki Yamanouchi, Sep 06 2014


LINKS



EXAMPLE

a(4) = 401. 401 > 961 > 2304 > 2044 > 2520 > 1651 > 4800 > 3066 > 2520 (cycle length = 4).  Hiroaki Yamanouchi, Sep 06 2014


CROSSREFS



KEYWORD

nonn,hard,more


AUTHOR



STATUS

approved



