a(n) is the smallest number m such that phi(m)+sigma(m)=n*pi(m).

Terms

a(0) =3a(1) =2a(2) =14a(3) =26a(4) =55a(5) =30a(6) =56a(7) =329a(8) =626a(9) =366a(10) =340a(11) =558a(12) =288a(13) =552a(14) =828a(15) =3496a(16) =6928a(17) =2430a(18) =81809a(19) =3920a(20) =3432a(21) =8680a(22) =48380a(23) =23430a(24) =2520a(25) =144020a(26) =435056a(27) =21384a(28) =728096a(29) =188376