|
|
A054573
|
|
Lesser members of g-reduced amicable pairs a < b such that sigma(a) = sigma(b) = a + b + gcd(a,b).
|
|
1
|
|
|
140, 174, 270, 280, 360, 552, 1002, 1146, 852, 1180, 1316, 984, 1575, 924, 1170, 2024, 1400, 2016, 2280, 4278, 3500, 4648, 3384, 5775, 5778, 4512, 6402, 3360, 4968, 10712, 5640, 10840, 12488, 14384, 14442, 13984, 9108, 14718, 15136, 15980, 11484, 19684, 22088
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
The terms are ordered according to the their larger counterparts (A054572). - Amiram Eldar, Jan 19 2019
|
|
LINKS
|
|
|
EXAMPLE
|
140 is in the sequence since it is the lesser member of the pair (140, 182), and sigma(140) = sigma(182) = 336 = 140 + 182 + gcd(140, 182).
|
|
MATHEMATICA
|
seq={}; Do[s1 = DivisorSigma[1, n]; Do[s2 = DivisorSigma[1, m]; If[s2 == s1 && s2 == n + m + GCD[n, m], AppendTo[seq, m]], {m, 1, n-1}], {n, 1, 1000}]; seq (* Amiram Eldar, Jan 19 2019 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
Name corrected and data corrected and extended by Amiram Eldar, Jan 19 2019
|
|
STATUS
|
approved
|
|
|
|