99919

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 57 ones.at n=10A031825
• Numbers having four 9's in base 10.at n=28A043528
• Define P(n,X) by the recursion P(1,X) = 1, P(n+1,X) = (P(n,X)+X)^2; then a(1) = 0 and for n > 1 a(n) is the coefficient of X^(2^(n-2)) in P(n,X) of degree 2^(n-1).at n=4A070256
• Near-repdigit semiprimes with 9 as repeated digit.at n=39A105990
• Monotonic ordering of nonnegative differences 10^i-3^j, for 40>=i>=0, j>=0.at n=31A192160