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

A189560

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

Terms

    a(0) =3a(1) =5a(2) =21a(3) =75a(4) =151a(5) =371a(6) =671a(7) =791a(8) =311a(9) =551a(10) =1271a(11) =1391a(12) =1031a(13) =2471a(14) =2231a(15) =4271a(16) =1991a(17) =3191a(18) =5351a(19) =7871a(20) =7751a(21) =7031a(22) =8951a(23) =8711a(24) =11831a(25) =5591a(26) =19631a(27) =10391a(28) =15791a(29) =20711

External references