Solutions to k + 2*phi(k) = sigma(k) where phi is A000010 and sigma is A000203.

A076373

Solutions to k + 2*phi(k) = sigma(k) where phi is A000010 and sigma is A000203.

Terms

    a(0) =10a(1) =44a(2) =184a(3) =752a(4) =3796a(5) =12224a(6) =49024a(7) =12580864a(8) =60610624a(9) =1091389696a(10) =2936313088a(11) =46672718384a(12) =58082557696a(13) =78857645056a(14) =118480915456a(15) =206158168064a(16) =292776422368a(17) =346109272672a(18) =393960181792

External references