53640

Appears in sequences

• Numbers k for which 2*k-1, 4*k-1, 8*k-1 and 16*k-1 are primes.at n=38A124494
• Number of 3 X 3 semimagic squares with distinct positive values and magic sum n.at n=20A173547
• Triangle, read by rows, where the g.f. of row n equals Product_{k=0..n-2} (n + k*y + n*y^2) for n > 1 with a single '1' in row 1.at n=28A324305
• Triangle, read by rows, where the g.f. of row n equals Product_{k=0..n-2} (n + k*y + n*y^2) for n > 1 with a single '1' in row 1.at n=32A324305