A318252 -id:A318252 - cp's OEIS frontend

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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.

Original entry on oeis.org

6144, 19329024, 939524096, 4026531840, 309237645312, 6146186280960, 52158082842624, 29273397577908224

Offset: 1

Amiram Eldar, Aug 22 2018

The larger numbers in each pair are in A318252.
Analogous to A002025 as A163272 is analogous to A000396.
If p and 4p+1 are primes then 2^(4p-1)*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.

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

Cf. A023212, A074206, A090866, A163272, A318252.

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

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