54531

Appears in sequences

• Numbers k such that (2*k)!/(2*(k!)^2) - 1 is prime.at n=37A112861
• G.f.: (-1+6*x)/(1-3*x-2*x^2).at n=9A246313
• a(n) = [x^n] 2 / (1 - (2*n - 1)*x + sqrt(1 - 2*x - 3*x^2)).at n=6A344556
• Numbers that are the sum of seven fourth powers in ten or more ways.at n=15A345576
• Numbers that are the sum of seven fourth powers in exactly ten ways.at n=10A345832
• Value of p^2 + (p-1)^2/2 as p runs through A001359 (the lesser of twin primes).at n=13A372069