Numbers k for which k = gcd(k', k"), where k' is the arithmetic derivative of k (A003415) and k" is the second derivative of k (A068346).

A361078

Numbers k for which k = gcd(k', k"), where k' is the arithmetic derivative of k (A003415) and k" is the second derivative of k (A068346).

Terms

    a(0) =4a(1) =16a(2) =27a(3) =64a(4) =108a(5) =432a(6) =729a(7) =1024a(8) =2916a(9) =3125a(10) =4096a(11) =6912a(12) =12500a(13) =16384a(14) =19683a(15) =27648a(16) =46656a(17) =50000a(18) =84375a(19) =110592a(20) =186624a(21) =314928a(22) =337500a(23) =746496a(24) =800000a(25) =823543a(26) =1048576a(27) =1259712a(28) =2125764a(29) =2278125

External references