28904

Appears in sequences

• a(n) = 10000*log(n) rounded to nearest integer.at n=17A004244
• a(n) = ceiling(10000*log(n)).at n=17A004245
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 85.at n=32A031583
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 85.at n=1A031763
• Number of lower triangles of a 3 X 3 0..n array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less.at n=28A195249
• a(n) = Sum_{d|n} (-1)^(n/d-1) * binomial(d+3,4).at n=27A366814