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A307052 Larger of amicable numbers pair m < n such that A307037(m) = n and A307037(n) = m. 1

%I #10 Mar 25 2019 04:39:22

%S 5,17,80,257,1280,4352,8060,65537,327680,1065220,1089452,1114112,

%T 16842752,100340800,383479200,466344000000

%N Larger of amicable numbers pair m < n such that A307037(m) = n and A307037(n) = m.

%C The terms are ordered according to their lesser counterparts (A307051).

%C a(17) > 4*10^12. - _Giovanni Resta_, Mar 24 2019

%t f[p_, e_] := p^e + (-1)^e; a[1] = 1; a[n_] := Times @@ f @@@ FactorInteger[n]; s={}; Do[m = a[n]; If[m > n && a[m] == n, AppendTo[s, m]], {n, 1, 10^7}]; s

%Y Cf. A307037, A307038, A307051.

%K nonn,more

%O 1,1

%A _Amiram Eldar_, Mar 21 2019

%E a(16) from _Giovanni Resta_, Mar 24 2019

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Last modified May 13 18:22 EDT 2024. Contains 372522 sequences. (Running on oeis4.)