a(n) = lcm(A051612(n), A065387(n)), where A051612(n) = sigma(n) - phi(n) and A065387(n) = sigma(n) + phi(n).

A077100

a(n) = lcm(A051612(n), A065387(n)), where A051612(n) = sigma(n) - phi(n) and A065387(n) = sigma(n) + phi(n).

Terms

    a(0) =0a(1) =4a(2) =6a(3) =45a(4) =10a(5) =70a(6) =14a(7) =209a(8) =133a(9) =154a(10) =22a(11) =96a(12) =26a(13) =90a(14) =32a(15) =897a(16) =34a(17) =495a(18) =38a(19) =850a(20) =220a(21) =598a(22) =46a(23) =884a(24) =561a(25) =270a(26) =638a(27) =748a(28) =58a(29) =320

External references