A307963 Larger of coreful amicable numbers pair: numbers (m, n) such that csigma(m) = csigma(n) = m + n, where csigma(n) is the sum of the coreful divisors of n (A057723).

2218040, 4924700, 6654120, 15526280, 14774100, 28834520, 37706680, 42142760, 34472900, 46578840, 51014920, 64323160, 68759240, 64021100, 82067480, 86503560, 90939640, 95375720, 104247880, 83719900, 113120040, 117556120, 93569300, 126428280, 103418700, 130864360

Offset

1,1

Comments

The terms are ordered according to the their lesser counterparts (A307962).

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Mathematica

f[p_, e_] := (p^(e+1)-1)/(p-1)-1; csigma[1]=1; csigma[n_] := Times @@ (f @@@ FactorInteger[n]); s={}; Do[m = csigma[n] - n; If[m > n && csigma[m] - m == n, AppendTo[s, m]], {n, 1, 10^8}]; s

Crossrefs

Cf. A057723, A307958, A307959, A307962.

Sequence in context: A254803 A254810 A253819 * A172802 A172851 A250980

Adjacent sequences: A307960 A307961 A307962 * A307964 A307965 A307966

Keyword

nonn

Author

Amiram Eldar, May 08 2019

Status

approved