Even refactorable numbers n such that the number r of odd divisors and the number s of even divisors are both even divisors of n and n is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of n.
A120356
Even refactorable numbers n such that the number r of odd divisors and the number s of even divisors are both even divisors of n and n is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of n.
Terms
- a(0) =12a(1) =24a(2) =80a(3) =180a(4) =240a(5) =360a(6) =480a(7) =720a(8) =896a(9) =1344a(10) =1440a(11) =1620a(12) =2688a(13) =3240a(14) =3360a(15) =4032a(16) =5040a(17) =6720a(18) =6912a(19) =8064a(20) =10080a(21) =13440a(22) =20160a(23) =20412a(24) =24300a(25) =25200a(26) =30000a(27) =30240a(28) =34560a(29) =40320
External references
- oeis: A120356