277727

Appears in sequences

• a(n) = a(n-1)^2 - 2, with a(0) = 5.at n=3A003487
• a(n) = 5*a(n-1) - a(n-2), with a(0) = 2, a(1) = 5.at n=8A003501
• Numerator of sum_{p prime, p-1 divides 2*n} 1/p.at n=39A027761
• Numerators of continued fraction convergents to sqrt(21).at n=15A041032
• Numerators of continued fraction convergents to sqrt(525).at n=7A042004
• a(n) = 23a(n-1) - a(n-2), starting with a(0) = 2 and a(1) = 23.at n=4A090731
• Denominator of Bernoulli_n multiplied by the sum of the associated inverse primes in the Staudt-Clausen theorem, n=1, 2, 4, 6, 8, 10,...at n=40A166306
• a(n) = n^4 + 8*n^3 + 20*n^2 + 16*n + 2.at n=21A304725