140452

Appears in sequences

• a(n) = 4*a(n-1) - a(n-2) with a(0) = 2, a(1) = 4.at n=9A003500
• Representation degeneracies for boson strings.at n=46A005291
• Arises from generalized Lucas-Lehmer test for primality.at n=7A018844
• Numerators of continued fraction convergents to sqrt(108).at n=11A041194
• Numerators of continued fraction convergents to sqrt(300).at n=5A041564
• Numerators of continued fraction convergents to sqrt(972).at n=9A042880
• Recurrence equation a(n+1) = a(n)^3 - 3*a(n) with a(0) = 4.at n=2A219160
• Array T(n,k) read by antidiagonals: T(n,k) = sum(i=0...n, (-1)^(n+i) * C(n+i,2i) * n/(2i+1) * k^(2i+1) ), n>0, k>1.at n=17A231123
• Sum of two consecutive primes that is also sum of two consecutive even positive squares.at n=17A236461
• Sides of (Heronian) triangles where sides are consecutive integers and area is an integer.at n=25A242497