Numbers k such that if x = k - phi(k) then k = sigma(x) - x, where phi(k) is the Euler totient function.

A239802

Numbers k such that if x = k - phi(k) then k = sigma(x) - x, where phi(k) is the Euler totient function.

Terms

    a(0) =36a(1) =42a(2) =186a(3) =222a(4) =270a(5) =390a(6) =396a(7) =440a(8) =656a(9) =2220a(10) =4140a(11) =5622a(12) =9400a(13) =20214a(14) =94816a(15) =282540a(16) =17578122a(17) =85046840a(18) =125948800a(19) =145805120a(20) =434435360a(21) =11152607958a(22) =11160256626

External references