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 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
 13312, 81551360, 1946157056, 128580583424, 12695923326976, 33590071001088, 2182874178519040, 59672695062659072 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The lesser numbers in each pair are in A318251. Analogous to A002046 as A163272 is analogous to A000396. If p and 4p+1 are primes then 2^(4p-2)*(4p+1) is in this sequence. LINKS Table of n, a(n) for n=1..8. 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, #A-1, f(A[k]))); isok(n)={my(a=f(n)); a

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Last modified June 22 09:08 EDT 2024. Contains 373568 sequences. (Running on oeis4.)