Find smallest pair (x,y) such that x^2-y^2 = 11...1 (n times) = (10^n-1)/9; sequence gives value of y.

A048612

Find smallest pair (x,y) such that x^2-y^2 = 11...1 (n times) = (10^n-1)/9; sequence gives value of y.

Terms

    a(0) =0a(1) =5a(2) =17a(3) =45a(4) =115a(5) =67a(6) =2205a(7) =2933a(8) =166667a(9) =44445a(10) =245795a(11) =6667a(12) =132683733a(13) =4444445a(14) =2012917a(15) =23767083a(16) =2680575317a(17) =666667a(19) =83053525a(20) =3263104267a(21) =12488376483a(23) =66666667

External references