Number n such that there are no primes of the form sigma(n)/k where 1 < k < n is a (proper) nondivisor of n.
A283147
Number n such that there are no primes of the form sigma(n)/k where 1 < k < n is a (proper) nondivisor of n.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =9a(4) =12a(5) =16a(6) =25a(7) =48a(8) =64a(9) =112a(10) =192a(11) =240a(12) =289a(13) =448a(14) =729a(15) =960a(16) =1344a(17) =1681a(18) =1984a(19) =2401a(20) =3481a(21) =4096a(22) =5041a(23) =6720a(24) =7921a(25) =10201a(26) =12288a(27) =15625a(28) =17161a(29) =27889
External references
- oeis: A283147