Least prime k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.

A189559

Least prime k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.

Terms

    a(0) =2a(1) =5a(2) =31a(3) =167a(4) =151a(5) =491a(6) =983a(7) =887a(8) =311a(9) =1151a(10) =1559a(11) =2111a(12) =1031a(13) =2711a(14) =4391a(15) =4271a(16) =3671a(17) =3191a(18) =5351a(19) =9551a(20) =11471a(21) =14759a(22) =8951a(23) =13751a(24) =11831a(25) =5591a(26) =19991a(27) =10391a(28) =15791a(29) =28031

External references