a(n) is smallest number such that a(n)^2 + 1 is divisible by 13^n.
A218709
a(n) is smallest number such that a(n)^2 + 1 is divisible by 13^n.
Terms
- a(0) =0a(1) =5a(2) =70a(3) =239a(4) =239a(5) =143044a(6) =1999509a(7) =6826318a(8) =6826318a(9) =822557039a(10) =52199939826a(11) =603633907222
External references
- oeis: A218709