a(n)^2 is the least square base-n doublet (base-n representation is the concatenation of 2 identical strings).
A020339
a(n)^2 is the least square base-n doublet (base-n representation is the concatenation of 2 identical strings).
Terms
- a(0) =6a(1) =2a(2) =615a(3) =84a(4) =119973a(5) =4a(6) =3a(7) =23620a(8) =36363636364a(9) =6a(10) =24766945690a(11) =17928148a(12) =915a(13) =4a(15) =6a(16) =130a(17) =10a(18) =2667a(21) =12a(22) =5a(24) =9a(25) =14a(27) =8130
External references
- oeis: A020339