43328

Appears in sequences

• First of three consecutive Ulam numbers (A002858) in arithmetic progression with difference 22.at n=25A068856
• Numbers k such that k![7]-1 is prime (where k![7] = A114799(k) = septuple factorial).at n=62A156167
• a(n) is the least integer k such that there are n values of i <= k for which gpf(i^2 + 1) = gpf(k^2 + 1), where gpf(x) is the greatest prime factor of x.at n=37A258840
• a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2*k,2*n-6*k).at n=22A387763