31001

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 12.at n=31A031690
• a(n) = binomial(n,0) - binomial(n,2) + binomial(n,4).at n=31A058923
• Łukasiewicz word for each rooted plane tree (interpretation e in Stanley's exercise 19) encoded by A014486 (or A063171), with the last leaf implicit, i.e., these words are given without the last trailing zero, except for the null tree which is encoded as 0.at n=38A071153
• Greater of number pair whose squares are reversals of each other, with no leading zeros allowed.at n=31A106324
• Number of partitions of n+6 with largest inscribed rectangle having area <= n.at n=33A218627
• A239461(n) / n^2.at n=30A239464
• Sequence A261220 shown in factorial base: a(n) = A007623(A261220(n)).at n=51A260743
• a(n) = 32*n^2 - 56*n + 25.at n=32A272129
• Number of nX7 0..1 arrays with every element equal to 0, 1 or 4 horizontally or vertically adjacent elements, with upper left element zero.at n=8A301661
• Non-Brauer numbers.at n=20A349044
• Recurrence a(1) = 1, a(2) = 5; a(n) = (a(n-1) + a(n-2))/GCD(a(n-1),a(n-2)) + 1.at n=39A349576
• Irregular triangle read by rows: row n lists all of the distinct derivable strings in the MIU formal system that are n characters long.at n=17A369173