18601

Appears in sequences

• Denominators of continued fraction convergents to sqrt(35).at n=8A041059
• McKay-Thompson series of class 21C for the Monster group.at n=24A058565
• Generalized Markoff numbers: union of numbers a, b, c, d satisfying the Markoff(4) equation a^2 + b^2 + c^2 + d^2 = 4*a*b*c*d.at n=13A075276
• Chebyshev T-sequence with Diophantine property.at n=4A077417
• a(n)*a(n+3) - a(n+1)*a(n+2) = 5, given a(0)=a(1)=1, a(2)=6.at n=9A080875
• Long leg of primitive Pythagorean triangles having legs that add up to a square, sorted on hypotenuse.at n=22A089548
• Numerator of x(n) = Sum_{k=1..n} ((odd part of k)/(k^3)).at n=4A111918
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 1, -1), (-1, 1, 1), (1, 0, 0)}.at n=11A148067
• Coefficient of x in the reduction (by x^2->x+1) of polynomial p(n,x) identified in Comments.at n=9A192347
• a(n) = n^4 + 3*n^3 - 3*n.at n=10A192398
• Centered 40-gonal numbers.at n=30A195317
• Largest number in a 6-tuple (a,b,c,d,e,f) of positive integers satisfying the Markoff(6) equation a^2 + b^2 + c^2 + d^2 + e^2 + f^2 = 3*a*b*c*d*e*f.at n=37A227204
• Numbers n such that phi(sigma(n)) = sigma(n) - phi(n).at n=11A230372
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 809", based on the 5-celled von Neumann neighborhood.at n=16A284177
• Number of partitions of n with seven parts in which no part occurs more than twice.at n=45A320595
• a(n) is the least exponent k greater than 1 such that prime(n)^k starts and ends in prime(n).at n=32A320775
• Expansion of (x/(8 * (1-x))) * d/dx(theta_3(x)^4).at n=35A374535
• Composite numbers that contain only nonprime digits and whose prime factors contain only nonprime digits.at n=37A383934