Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.
A120358
Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.
Terms
- a(0) =2a(1) =18a(2) =72a(3) =450a(4) =1250a(5) =4050a(6) =16200a(7) =52488a(8) =56448a(9) =64800a(10) =71442a(11) =101250a(12) =198450a(13) =235298a(14) =285768a(15) =328050a(16) =405000a(17) =793800a(18) =1036800a(19) =1312200a(20) =1620000a(21) =1786050a(22) =3175200a(23) =4572288a(24) =4961250a(25) =5248800a(26) =7144200a(27) =12700800a(28) =14289858a(29) =15059072
External references
- oeis: A120358