21485

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 67.at n=21A020406
• Decimal part of cube root of a(n) starts with 8: first term of runs.at n=26A034134
• Partial sums of A000960.at n=42A099074
• Number of 0..n arrays x(0..3) of 4 elements with nondecreasing average value.at n=18A200764
• Total sum T(n,k) of the sizes of all blocks with maximal element k in all set partitions of {1,2,...,n}; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=41A270701
• Total sum T(n,k) of the sizes of all blocks with minimal element k in all set partitions of {1,2,...,n}; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=39A270702
• Total sum of the sizes of all blocks with maximal element 6 in all set partitions of {1,2,...,n}.at n=3A270760
• Total sum of the sizes of all blocks with minimal element 4 in all set partitions of {1,2,...,n}.at n=5A270767
• Numbers in A231626 but not in A343302; first of 5 consecutive deficient numbers in arithmetic progression with common difference > 1.at n=37A343303
• Number T(n,k) of partitions of [n] having k blocks containing their own index when blocks are ordered with decreasing largest elements; triangle T(n,k), n>=0, 0<=k<=ceiling(n/2), read by rows.at n=37A350647