42000

Appears in sequences

• Theta series of A_6 lattice.at n=31A008446
• a(n) = A046673(n)/2.at n=3A046674
• a(n) = n! * Sum_{k=1..floor(n/2)} 1/(2k).at n=8A092691
• Expansion of e.g.f. -log(1-x)/(1-x^2).at n=8A092692
• Triangle read by rows: (1/n)*T(n,h), where T(n,h) is the array in A101817.at n=24A101818
• Expansion of ((eta(q^2) * eta(q^14)) / (eta(q) * eta(q^7)))^3 in powers of q.at n=22A120006
• Expansion of eta(q^4) * eta(q^28) / (eta(q) * eta(q^7)) in powers of q.at n=45A123648
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=11.at n=13A135196
• Triangle T(n, k) = n! * StirlingS1(n, k)/binomial(n, k), read by rows.at n=25A142473
• Partition number array, called M31(-5), related to A049411(n,m) = S1(-5;n,m) (generalized Stirling triangle).at n=32A144879
• a(n) = ((2+sqrt(5))*(5+sqrt(5))^n + (2-sqrt(5))*(5-sqrt(5))^n)/2.at n=5A162773
• Totally multiplicative sequence with a(p) = 10p for prime p.at n=41A166631
• Numbers m such that m*reversal(m)+1 is a palindrome.at n=14A177856
• Area A of the triangles such that A, the sides and two medians are integers.at n=4A181928
• Number of nondecreasing arrangements of 6 numbers x(i) in -(n+4)..(n+4) with the sum of sign(x(i))*x(i)^2 zero.at n=25A188006
• Numbers with prime factorization pqr^3s^4.at n=9A190294
• Molecular topological indices of the square graphs.at n=5A192839
• Triangle with entry a(n,m) giving the total number of necklaces of n beads (C_n symmetry) with n colors available for each bead, but only m distinct colors present, with m from {1, 2, ..., n} and n >= 1.at n=24A213935
• Easter occurrences on March 22, March 23, ..., April 25 during a 5,700,000-year Gregorian Easter cycle.at n=34A224110
• G.f.: A(x,y) = Sum_{n>=0} exp(-y/(1-n*x)) * y^n/(1-n*x)^n / n!.at n=32A245111