Numbers k such that uphi(k)*usigma(k) = uphi(k+1)*usigma(k+1), where uphi is the unitary totient function (A047994) and usigma the sum of unitary divisors (A034448).
A297365
Numbers k such that uphi(k)*usigma(k) = uphi(k+1)*usigma(k+1), where uphi is the unitary totient function (A047994) and usigma the sum of unitary divisors (A034448).
Terms
- a(0) =5a(1) =11a(2) =19a(3) =71a(4) =247a(5) =271a(6) =991a(7) =2232a(8) =6200a(9) =8271a(10) =10295a(11) =16744a(12) =18496a(13) =18576a(14) =25704a(15) =26656a(16) =102175a(17) =122607a(18) =166624a(19) =225939a(20) =301103a(21) =747967a(22) =7237384a(23) =7302592a(24) =15760224a(25) =21770800a(26) =28121184a(27) =72967087a(28) =98617024a(29) =104577848
External references
- oeis: A297365