Numbers k such that (A003961(k)-2*k) divides (A003961(k)-sigma(k)), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and sigma is the sum of divisors function.
A378980
Numbers k such that (A003961(k)-2*k) divides (A003961(k)-sigma(k)), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and sigma is the sum of divisors function.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =7a(6) =10a(7) =25a(8) =26a(9) =28a(10) =33a(11) =46a(12) =55a(13) =57a(14) =69a(15) =91a(16) =93a(17) =496a(18) =1034a(19) =1054a(20) =1558a(21) =2211a(22) =2626a(23) =4825a(24) =8128a(25) =11222a(26) =12046a(27) =12639a(28) =28225a(29) =32043
External references
- oeis: A378980