831290

Appears in sequences

• Tetranacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4), with a(0)=a(1)=0, a(2)=1, a(3)=2.at n=23A001630
• Even Quasi-Carmichael numbers.at n=21A262252
• Number of palindromic binary strings of length n having no 4-runs of 1's.at n=42A382478