Numbers k such that phi(k) + 1 = x^2 and sigma(k) + 1 = y^2 for some x and y.

Terms

a(0) =15a(1) =35a(2) =56a(3) =72a(4) =78a(5) =84a(6) =123a(7) =143a(8) =165a(9) =323a(10) =543a(11) =627a(12) =678a(13) =728a(14) =814a(15) =836a(16) =899a(17) =1350a(18) =1484a(19) =1535a(20) =1683a(21) =1763a(22) =1846a(23) =2296a(24) =2967a(25) =3288a(26) =3444a(27) =3599a(28) =3784a(29) =4103