21621

Appears in sequences

• 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 98.at n=28A031596
• Number of partitions of n into parts not of the form 25k, 25k+12 or 25k-12. Also number of partitions with at most 11 parts of size 1 and differences between parts at distance 11 are greater than 1.at n=38A036011
• Trajectory of 18 under iteration of the map k -> A087712(k).at n=30A077960
• Numbers k such that k and k^2 use only the digits 1, 2, 4, 6 and 7.at n=28A136993
• Number of integer partitions of n without an alternating permutation.at n=44A345165
• Numbers that are the sum of seven fourth powers in six or more ways.at n=35A345572
• Numbers that are the sum of seven fourth powers in exactly six ways.at n=26A345828