Odd numbers n such that sigma(sigma(n^2)) is odd.

Terms

a(0) =1a(1) =9a(2) =38423a(3) =104855a(4) =247863a(5) =313929a(6) =345807a(7) =376095a(8) =469623a(9) =623615a(10) =787127a(11) =943695a(12) =985369a(13) =1606281a(14) =1754039a(15) =1933815a(16) =2034423a(17) =2181409a(18) =3043401a(19) =5147241a(20) =5545617a(21) =5612535a(22) =6385703a(23) =7084143a(24) =8868321a(25) =10606679a(26) =11470511a(27) =11954409a(28) =12276745a(29) =12794655