A020780 Decimal expansion of 1/sqrt(23).

2, 0, 8, 5, 1, 4, 4, 1, 4, 0, 5, 7, 0, 7, 4, 7, 6, 2, 6, 7, 8, 1, 4, 9, 4, 8, 1, 0, 5, 0, 5, 5, 1, 9, 0, 9, 5, 6, 5, 0, 7, 4, 2, 1, 9, 2, 1, 3, 2, 2, 3, 0, 1, 5, 0, 6, 4, 5, 7, 8, 6, 5, 7, 1, 4, 9, 9, 2, 4, 2, 2, 7, 6, 4, 8, 1, 5, 0, 6, 1, 2, 2, 8, 2, 2, 6, 9, 1, 9, 3, 3, 2, 3, 3, 4, 4, 2, 9, 8