25359

Appears in sequences

• a(n) = least number not of form [ (a^2/n) ] + [ (b^2)/n ].at n=27A036575
• G.f.: A(x) = exp(Sum_{n>=1} A157311(n)*x^n/n) = Product_{n>=1} (1 + A157311(n-1)*x^n).at n=9A157312
• Numbers k such that (8*10^k + 49)/3 is prime.at n=31A270890
• Ulam numbers k such that k/3 is also an Ulam number.at n=35A287212
• Products p*q*r of three distinct primes such that (p*q) mod r, (p*r) mod q and (q*r) mod p are all prime.at n=28A338704