21696

Appears in sequences

• Conjectured number of irreducible multiple zeta values of depth 8 and weight 2n+22.at n=17A022496
• 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 73.at n=37A031571
• a(n) in base 15 is a repdigit.at n=48A048339
• Expansion of 1/(1-4x-4x^3).at n=7A089979
• Triangle read by rows: T(n,k) is the number of Motzkin paths of length n and having k peaks at odd height.at n=58A097891
• Structured truncated octahedral numbers.at n=15A100155
• Sums of Pythagorean sextuples in increasing order: The sums of sets of six natural numbers which correspond to the lengths of the edges of a tetrahedron whose four faces are all different Pythagorean triangles.at n=36A248548
• Numbers k such that 327*2^k+1 is prime.at n=22A322956
• Number of binary strings w of length n that cannot be written in the form xyz, with x,z both nonempty and xz a square.at n=18A323446
• Index of first occurrence of n in A364197.at n=45A364198