28231

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 48.at n=6A031726
• Start of the first run of exactly n consecutive odd composite numbers.at n=22A075067
• Structured octagonal anti-prism numbers.at n=20A100184
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-0100 pattern in any orientation.at n=14A146837
• Number of n X n binary arrays with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.at n=8A147035
• 7 times octagonal numbers: a(n) = 7*n*(3*n-2).at n=37A153797
• a(n) = 49*n^2 + 7.at n=23A158481
• Length of longest chain of nonempty proper inverse subsemigroups of the dual symmetric inverse monoid.at n=7A262296
• (r,1)-greedy sequence, where r(k) = k/log(k+1).at n=3A270749
• L.g.f.: log(Sum_{k>=0} k! * x^(k*(k + 1)/2) / Product_{j=1..k} (1 - x^j)).at n=26A331337