Smallest m, such that there are exactly n solutions of the equation (m+k)' = m' + k', where 1 <= k <= 2*m and x' = A003415(x), the arithmetic derivative of x.
A258138
Smallest m, such that there are exactly n solutions of the equation (m+k)' = m' + k', where 1 <= k <= 2*m and x' = A003415(x), the arithmetic derivative of x.
Terms
- a(0) =1a(1) =2a(2) =14a(3) =70a(4) =166a(5) =350a(6) =1050a(7) =2002a(8) =1870a(9) =4730a(10) =5170a(11) =9350a(12) =15106a(13) =29050a(14) =45318a(15) =65450a(16) =25850a(17) =139590a(18) =75530a(19) =129250a(20) =180950a(21) =226590a(22) =383350a(23) =341530a(24) =377650a(25) =551650a(26) =697950a(27) =439450a(28) =1127610a(29) =1489950
External references
- oeis: A258138