1321442641

Appears in sequences

• Numbers k such that k^2 is centered hexagonal.at n=8A001570
• Denominators of continued fraction convergents to sqrt(12).at n=16A041017
• Denominators of continued fraction convergents to sqrt(48).at n=16A041083
• Binomial transform of sinh(x)*cosh(sqrt(3)*x).at n=17A084156
• a(2n) = A001570(n), a(2n+1) = -A007654(n+1).at n=16A108946
• a(2*n) = A001570(n), a(2*n+1) = A011943(n+1).at n=16A110293
• Primes of the form ((2 + sqrt(3))^(2*k+1) + (2 - sqrt(3))^(2*k+1))/4.at n=6A117808
• Triangle T(n, k) = 2*(-1 + 2*k)*T(n-1, k) - T(n-2, k) with T(-2, k) = T(-1, k) = 1, read by rows.at n=32A122053
• a(n) = 14*a(n-1) - a(n-2), with a(1) = a(2) = 1.at n=9A122571
• Numerators of continued fraction convergents to sqrt(3)/2.at n=17A144535
• Numerators of fractions x^n + y^n, where x + y = 1 and x^2 + y^2 = 2.at n=33A173299
• Primes in A173299.at n=15A173929
• Exceptional primes: those for which Eq. (4.8) in Cosgrave and Dilcher (2011) fails.at n=6A239902