Squares that remain squares if you decrease them by 7 times a repunit with the same number of digits.
A273233
Squares that remain squares if you decrease them by 7 times a repunit with the same number of digits.
Terms
- a(0) =81a(1) =841a(2) =7921a(3) =77841a(4) =790321a(5) =863041a(6) =982081a(7) =9991921a(8) =79014321a(9) =80299521a(10) =94653441a(11) =7901254321a(12) =8635799041a(13) =778133930161a(14) =790123654321a(15) =794396081521a(16) =816057482881a(17) =965485073281a(18) =989863816561
External references
- oeis: A273233