21987

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 17 ones.at n=22A031785
• L-th order palindromes with L > 2.at n=13A089381
• Consider the base-8 Kaprekar map n->K(n) defined in A165090. Sequence gives numbers belonging to cycles, including fixed points.at n=14A165095
• Consider the base-8 Kaprekar map n->K(n) defined in A165090. Sequence gives numbers belonging to cycles of length greater than 1.at n=11A165097
• Number of partitions p of n such that mean(p) < multiplicity(min(p)).at n=41A240203
• Number of partitions p of n such that mean(p) <= multiplicity(min(p)).at n=41A240204
• Number of (5+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 7.at n=13A252389
• Complement of A269020: numbers not of the form ceiling(n^(1+1/n)).at n=10A269023
• Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join a circle through every unordered triple of non-collinear points: a(n) is the number of distinct circles created.at n=14A385159