2283121

Appears in sequences

• Squares that are a sum of twin primes and their indices.at n=7A088188
• Expansion of g.f. -(1+27*x^2)/((1+3*x)*(1-2*x+9*x^2)).at n=13A106632
• Perfect squares which can be written neither as a^2+b^2, nor as a^2+2*b^2, nor as a^2+3*b^2, nor as a^2+7*b^2, with a > 0 and b > 0.at n=16A216408
• Odd squares not of the form p + 2^k with p prime.at n=21A276567
• Determinant of the pentadiagonal symmetric n X n Toeplitz Matrix with a=b=1, c=2.at n=25A360261