Numbers k such that k | 3^k + 1.

Terms

a(0) =1a(1) =2a(2) =10a(3) =50a(4) =250a(5) =1250a(6) =5050a(7) =6250a(8) =11810a(9) =25250a(10) =31250a(11) =59050a(12) =126250a(13) =156250a(14) =295250a(15) =510050a(16) =631250a(17) =750250a(18) =781250a(19) =1476250a(20) =2125250a(21) =2550250a(22) =3156250a(23) =3751250a(24) =3906250a(25) =5964050a(26) =7381250a(27) =10626250a(28) =12751250a(29) =13947610