438751

Appears in sequences

• Pentagonal numbers (A000326) that are also brilliant numbers (A078972).at n=26A113941
• Semiprimes of the form (4*n + 1)*(6*n + 1) = 24*n^2 + 10*n + 1.at n=19A255584
• The first of two consecutive pentagonal numbers the sum of which is equal to the sum of two consecutive primes.at n=14A298463
• Frobenius pseudoprimes == 1,4 (mod 5) with respect to Fibonacci polynomial x^2 - x - 1.at n=30A319168