2250000

Appears in sequences

• Scaled Chebyshev U-polynomial evaluated at sqrt(5)/2.at n=11A030191
• a(n) is the n-th quintic factorial number divided by 5.at n=5A034325
• Sum of digits of numbers between 0 and (10^n)-1.at n=5A034967
• a(1)=0, a(2)=9; then distinct squares such that the sum of three successive terms is a square.at n=17A075373
• a(n) = (n+1)*a(n-5), with a(0)=a(1)=a(2)=a(3)=a(4)=1.at n=29A081408
• Binomial transform of Fibonacci(2n).at n=12A093131
• Expansion of ((1+x)^4-(1+x)x^3)/((1+x)^5-x^5).at n=24A105370
• Numbers of the form (5^i)*(12^j), with i, j >= 0.at n=34A108201
• Squares that remain squares if prefixed with a 1.at n=4A167035
• Squares that remain squares when prefixed with a 4.at n=8A167038
• Squares that remain squares when prefixed with a 7.at n=4A167042
• Number of n X 5 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=29A208066
• a(n) = Sum_{k = 1..2*n} binomial(2*n,k) * Fibonacci(2*k).at n=6A219462
• a(n) = Sum_{k >= 0}(-1)^k*binomial(n,5*k+1).at n=25A289321
• a(n) = Sum_{k >= 0}(-1)^k*binomial(n,5*k+1).at n=26A289321
• a(n) = Sum_{k>=0} (-1)^k*binomial(n,5*k+4).at n=25A289389
• Numbers k such that sigma(k) - 3k is prime.at n=21A306492
• The fifth power of the unsigned Lah triangular matrix A105278.at n=15A308282
• Squares where larger digits have smaller multiplicity.at n=31A378498
• Perfect powers k^m, m > 1, omega(k) > 1, such that A053669(k) > A006530(k) that are not also products of primorials, where omega = A001221.at n=28A380452