

A318251


Lesser 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 larger numbers in each pair are in A318252.
If p and 4p+1 are primes then 2^(4p1)*p is in this sequence, therefore if A023212 is infinite then also this sequence is.
The terms were calculated using an extended list of terms of A025487.


LINKS



EXAMPLE

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


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



