2910600

Appears in sequences

• Numbers k such that sigma(k) - usigma(k) > 3k.at n=14A063875
• Variant sequence generated by solving the order n X n linear problem [H]x = b where b is the unit vector and the sequence term is given by the denominator of the last unknown xn.at n=11A124266
• Numbers that are products of distinct primorial numbers (see A002110).at n=34A129912
• a(n) = number of elements of order n in simple group Alt(11) of order 19958400.at n=11A145822
• a(n) = v(n)/A000178(n), v = A203470, A000178 = (superfactorials).at n=4A203471
• a(n) = sigma_2(n)*Pell(n), where sigma_2(n) = A001157(n), the sum of squares of divisors of n.at n=11A204272
• Number of 7Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=8A208146
• Triangle read by rows, T(n,k) = C(2*n,n+k)*Sum_{m=0..k} (-1)^(m+k)*C(n+k,n+m)* Stirling1(n+m,m), for n>=0 and 0<=k<=n.at n=25A268440
• T(n, m), denominators of coefficients in a power/Fourier series expansion of the plane pendulum's exact phase space trajectory.at n=16A273507
• If 2n = 2^e1 + 2^e2 + ... + 2^ek [e1 .. ek distinct], then a(n) = A002110(e1) * A002110(e2) * ... * A002110(ek).at n=26A283477
• Odd bisection of A278243: a(n) = A046523(A277324(n)).at n=33A284573
• Irregular triangle read by rows: T(r,c) is the product of the number of standard Young tableaux (A117506) and the number of semistandard Young tableaux (A262030) for partitions of r.at n=53A380611