Numbers k such that k divides sigma(A003961(k)), where A003961 is fully multiplicative with a(p) = nextprime(p), and sigma is the sum of divisors function.

A389469

Numbers k such that k divides sigma(A003961(k)), where A003961 is fully multiplicative with a(p) = nextprime(p), and sigma is the sum of divisors function.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =6a(4) =8a(5) =24a(6) =40a(7) =120a(8) =156a(9) =351a(10) =640a(11) =672a(12) =702a(13) =1000a(14) =1404a(15) =1920a(16) =2808a(17) =2912a(18) =3000a(19) =3696a(20) =8736a(21) =11232a(22) =14040a(23) =14508a(24) =15744a(25) =16000a(26) =26208a(27) =26240a(28) =29792a(29) =44928

External references