18750

Appears in sequences

• Expansion of (1+x)/(1-5*x).at n=6A003948
• a(n) = Product_{j=0..5} floor((n+j)/6).at n=31A008881
• Triangle of coefficients in expansion of (1+5x)^n.at n=26A013612
• Number of integer points (x,y,z) at distance <= 0.5 from sphere of radius n.at n=39A016728
• Numbers of form 5^i*6^j, with i, j >= 0.at n=22A025622
• a(n) = Sum_{k=0..n} (k+1) * T(n,k), with T given by A026374.at n=10A026950
• a(n) = n^3 * Product_{p|n, p prime} (1 + 1/p).at n=24A033196
• Triangle whose (i,j)-th entry is 5^(i-j)*binomial(i,j).at n=22A038243
• Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*6^j.at n=16A038248
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*5^j.at n=19A038259
• Sums of two distinct powers of 5.at n=20A038474
• Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n-3)/3.at n=34A048035
• a(n) = n*5^(n-1).at n=6A053464
• Triangle read by rows: T(n,k) = number of labeled endofunctions on n points with k fixed points.at n=22A055134
• Sums of two powers of 5.at n=26A055237
• a(n) = n*(n-1)^(n-1).at n=5A055897
• Numbers n such that n | 4^n + 3^n + 2^n + 1^n.at n=30A056643
• Numbers n such that n | 12^n + 11^n + 10^n + 9^n + 8^n.at n=41A057250
• Numbers n such that n | 10^n + 9^n + 8^n + 7^n + 6^n.at n=40A057252
• Numbers k such that k | 6^k + 5^k + 4^k + 3^k + 2^k.at n=29A057256