52519

Appears in sequences

• Numerators of continued fraction convergents to sqrt(391).at n=8A041742
• Least m such that 2^n+5^m is prime.at n=39A123342
• Semiprimes in A007504 (the sum of first n primes).at n=38A189072
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant in {0,1,...,n}.at n=29A209995
• G.f.: Product_{k>=1} (1 + x^(k*(k+1))) / (1 - x^k).at n=37A280423