a(n) is smallest number such that a(n)^2 + 1 is divisible by 5^n.
A034939
a(n) is smallest number such that a(n)^2 + 1 is divisible by 5^n.
Terms
- a(0) =0a(1) =2a(2) =7a(3) =57a(4) =182a(5) =1068a(6) =1068a(7) =32318a(8) =110443a(9) =280182a(10) =3626068a(11) =23157318a(12) =120813568a(13) =123327057a(14) =1097376068a(15) =11109655182a(16) =49925501068a(17) =355101282318a(18) =355101282318
External references
- oeis: A034939