Least integer m > 0 with pi(m*n) = sigma(m), where sigma(m) is the sum of all positive divisors of m.
A247603
Least integer m > 0 with pi(m*n) = sigma(m), where sigma(m) is the sum of all positive divisors of m.
Terms
- a(0) =1a(1) =2a(2) =23a(3) =61a(4) =8a(5) =22a(6) =16a(7) =12a(8) =202a(9) =386a(10) =30a(11) =36a(12) =174a(13) =10745a(14) =1684a(15) =2804a(16) =1616a(17) =40006a(18) =6764a(19) =996a(20) =5775a(21) =8131355a(22) =19974a(23) =11264a(24) =4446a(25) =27882a(26) =4848a(27) =32466a(28) =162712a(29) =532313373
External references
- oeis: A247603