202470

Appears in sequences

• Numbers k such that prime(k) +/- k and prime(k) +/- 2k are all primes.at n=22A112530
• a(n) = 225*n^2 - n.at n=29A156813
• a(n) = 900*n^2 - 2*n.at n=14A158408
• a(n) = 900*n^2 - 30.at n=14A158669
• Number of rooted graceful labelings with n edges.at n=9A338987