31683

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n-2)/2.at n=20A047184
• Numbers k such that k + 1 has one more divisor than k.at n=25A055927
• Numbers n not of the form i^2+(i+1)^2 such that there are integers a < b with a^2+(a+1)^2+...+(n-1)^2 = n^2+(n+1)^2+...+b^2.at n=23A094523
• Number of set partitions of [n] such that the difference between each element and its block index is a multiple of ten.at n=32A274843
• Number of compositions (ordered partitions) of n into distinct parts where no part is a multiple of 3.at n=41A332309
• Starts of runs of 3 consecutive anti-tau numbers (A046642).at n=37A341780
• Numbers m such that abs(K(m+1) - K(m)) = 1, where K(m) = A002034(m) is the Kempner function.at n=29A346211
• a(n) = F(n)*F(n+1) mod L(n+2) where F=A000045 is the Fibonacci numbers and L = A000032 is the Lucas numbers.at n=20A348592