Minimum integer m for which n*m = n'*m', where n' and m' are the arithmetic derivatives of n and m. Zero if m does not exist.

A211222

Minimum integer m for which n*m = n'*m', where n' and m' are the arithmetic derivatives of n and m. Zero if m does not exist.

Terms

    a(0) =16a(1) =64a(2) =4a(3) =1024a(4) =20a(5) =16384a(6) =9a(7) =8a(8) =1372a(9) =4194304a(10) =0a(11) =67108864a(12) =0a(13) =0a(14) =2a(15) =17179869184a(16) =77948684a(17) =274877906944a(18) =6a(19) =1000a(20) =42417997492a(22) =1771561a(23) =32a(24) =300a(25) =3125a(26) =0

External references