86581

Appears in sequences

• Truncated square pyramid numbers: a(n) = Sum_{k = n..2*n} k^2.at n=33A050409
• Expansion of x^2*(1+x-x^2)/(1-2*x-4*x^2+x^3+x^4).at n=11A123947
• a(0) = 6, a(1) = 17, a(n+1) = a(n) + a(n-1) for n>0.at n=19A166025
• Numbers having in binary representation more zeros than their squares.at n=14A293655
• a(n) is the largest k such that k^2 has a maximal Hamming weight A357658(n) in the range 2^n <= k^2 < 2^(n+1).at n=30A357660