A092904 Number of decimal digits in the denominator of the Bernoulli number B(2n).

1, 1, 2, 2, 2, 2, 4, 1, 3, 3, 3, 3, 4, 1, 3, 5, 3, 1, 7, 1, 5, 4, 3, 3, 5, 2, 4, 3, 3, 3, 8, 1, 3, 5, 2, 4, 9, 1, 2, 4, 6, 3, 7, 1, 5, 6, 4, 1, 7, 1, 5, 4, 4, 3, 9, 4, 7, 2, 4, 1, 10, 1, 2, 7, 3, 4, 7, 1, 4, 6, 6, 1, 10, 1, 4, 7, 2, 3, 10, 1, 6, 6, 4, 4, 7, 2, 4, 4, 7, 4, 13, 1, 4, 2, 2, 5, 9, 1, 6, 9, 7