Smallest number a(n) == -1 (mod n) such that the prime signature of n and a(n) is the same, or 0 if no such number exists.

A085075

Smallest number a(n) == -1 (mod n) such that the prime signature of n and a(n) is the same, or 0 if no such number exists.

Terms

    a(0) =3a(1) =2a(2) =0a(3) =19a(4) =35a(5) =13a(6) =343a(7) =0a(8) =39a(9) =43a(10) =275a(11) =103a(12) =55a(13) =14a(14) =0a(15) =67a(16) =539a(17) =37a(18) =99a(19) =62a(20) =21a(21) =137a(22) =2375a(23) =49a(24) =51a(25) =4913a(26) =279a(27) =173a(28) =2639a(29) =61

External references