25540

Appears in sequences

• Let r, s, t, u be four permutations of the set { 1, 2, 3, ..., n }; a(n) = minimal value of Sum_{i=1..n} r(i)*s(i)*t(i)*u(i).at n=14A070736
• Number of (n,4) Freiman-Wyner sequences.at n=11A097926
• Numbers n such that there is no square n-gonal number greater than 1.at n=27A188896
• Smallest numbers leading in n steps to a term that repeats itself, according to the rule explained in A316650 (and hereunder in the Comment section).at n=45A316678
• The number of regions inside a pentagram formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.at n=3A331906