OFFSET
1,1
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..1001
EXAMPLE
135 has eight divisors: 1, 3, 5, 9, 15, 27, 45, 135. Of these only two, d = 1 and d = 9 are such that A048720(A065621(d),135/d) = 135, thus A325565(135) = 2. On the other hand, when iterating A325567 starting from 135 we get: A325567(135) = 9, A325567(9) = 3 and A325567(3) = 1, so A325568(135) = 3 > A325565(135), thus 135 is included in this sequence.
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 09 2019
STATUS
approved