Least positive integer m such that m*n divides sigma(m^2+n^2), where sigma(k) is the sum of all positive divisors of k.
A248189
Least positive integer m such that m*n divides sigma(m^2+n^2), where sigma(k) is the sum of all positive divisors of k.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =7a(4) =2a(5) =38a(6) =4a(7) =81a(8) =1a(9) =102a(10) =868a(11) =1a(12) =9a(13) =3a(14) =702a(15) =26505a(16) =1554a(17) =14a(18) =3a(19) =243a(20) =1a(21) =650a(22) =108a(23) =1833a(24) =34542a(25) =18a(26) =68a(27) =186a(28) =7252a(29) =39
External references
- oeis: A248189