67801

Properties

Appears in sequences

• a(n) = Sum_{k=0..floor(n/6)} C(n-3k,3k) * 2^k.at n=23A100135
• Primes of the form 1+2*n+3*n^2.at n=20A122430
• Smallest prime factor of n! + 2n - 1.at n=53A139466
• Maxima of the numerators (and also of the denominators) of row n in the Schinzel-Sierpinski tree of fractions A295511.at n=12A295509
• Prime numbersat n=6754