18032

Appears in sequences

• Numbers k such that 51*2^k+1 is prime.at n=34A032375
• Coefficient of X^2 in expansion of (1 + n*X + n*X^2)^n.at n=13A092365
• Sum of proper divisors minus the number of proper divisors of Fibonacci number A000045(n).at n=24A152990
• G.f.: A(q) = exp( Sum_{n>=1} A002129(n) * 2*A006519(n) * q^n/n ).at n=37A161800
• G.f. is Q_1(q) where q*Q_1(q^4) is a series quadrisection of the g.f. of A161800.at n=9A161802
• Partial sums of (A006899, prefixed by a 1).at n=21A170804
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+217)^2 = y^2.at n=26A198294
• Numbers m such that the GCD of the x's that satisfy sigma(x) = m is 3.at n=29A241648
• a(n) = 23*n^2.at n=28A244632
• Number of nX6 0..1 arrays with every element equal to 0, 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=6A299559
• Number of n X 7 0..1 arrays with every element equal to 0, 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=5A299560
• a(n) = 7*n^3 - 6*n^2.at n=13A382251