

A318252


Larger of amicable numbers pair (m, n) such that n = H(m) and m = H(n) where H(n) = A074206(n) is the number of ordered factorizations of n.


1




OFFSET

1,1


COMMENTS

The lesser numbers in each pair are in A318251.
If p and 4p+1 are primes then 2^(4p2)*(4p+1) is in this sequence.


LINKS



EXAMPLE

13312 is in the sequence since A074206(13312) = 6144 and A074206(6144) = 13312.


PROG

(PARI) f(n) = if( n<2, n>0, my(A = divisors(n)); sum(k=1, #A1, f(A[k])));
isok(n)={my(a=f(n)); a<n && f(a)==n; } \\ Michel Marcus, Sep 26 2018


CROSSREFS



KEYWORD

nonn,more


AUTHOR



STATUS

approved



