a(n) = n * A033885(A003961(n)), where A033885(n) = 3*n-sigma(n), and A003961 is fully multiplicative with a(p) = nextprime(p).
A388977
a(n) = n * A033885(A003961(n)), where A033885(n) = 3*n-sigma(n), and A003961 is fully multiplicative with a(p) = nextprime(p).
Terms
- a(0) =2a(1) =10a(2) =27a(3) =56a(4) =65a(5) =126a(6) =147a(7) =328a(8) =396a(9) =310a(10) =275a(11) =684a(12) =429a(13) =714a(14) =855a(15) =1952a(16) =629a(17) =1818a(18) =855a(19) =1700a(20) =1953a(21) =1342a(22) =1311a(23) =3960a(24) =2250a(25) =2106a(26) =5913a(27) =3948a(28) =1769a(29) =3690
External references
- oeis: A388977