251221

Properties

Appears in sequences

• a(n) = 4*a(n-1) + 1, a(1) = 15.at n=7A072201
• a(n) is the least prime p such that exponent of highest power of 2 dividing 3p+1 equals n.at n=14A087964
• a(n) = (n + 1/3)*2^(n-1) - 1/2 + (-1)^(n-1)*(1/6).at n=14A127981
• a(n) = 1681*n^2 - 2606*n + 1010.at n=12A157110
• Primes of the form (1 + k + k^3)/3.at n=8A163512
• Centered 20-gonal (or icosagonal) primes.at n=34A264845
• Prime numbersat n=22138