7812500

Appears in sequences

• a(0) = 1; a(n) = 4*5^(n-1) for n >= 1.at n=10A005054
• a(n) = 5*a(n-2), starting 1,2,4.at n=20A026395
• a(1)=5. For n > 1, a(n) = 4*5^(n-1) = A005054(n).at n=9A110595
• Number of palindromes of length n (in base 5).at n=18A117857
• Number of palindromes of length n (in base 5).at n=19A117857
• a(1)=1, a(n) = (p-1)*a(n-1), if n is even, otherwise a(n) = p*a(n-2), where p = 5.at n=19A133632
• a(4*n)=5^n, a(4*n+1)=2*5^n, a(4*n+2)=3*5^n, a(4*n+3)=4*5^n.at n=39A140730
• a(n) = 5*a(n-2) for n > 2; a(1) = 4, a(2) = 5.at n=18A163141
• Number of solutions to gcd(x^2 + y^2 + z^2 + t^2 + h^2, n) = 1 with x,y,z,t,h in [0,n-1].at n=24A238533
• a(n) = n^10 - n^9.at n=5A240933
• Numbers k such that the k-th cyclotomic polynomial has a root mod 5.at n=29A245478
• a(n) = n^(2*n) - n^(2*n - 1).at n=4A259926
• Hypotenuses for which there exist exactly 9 distinct integer triangles.at n=3A290500
• Terms of A140110 that are not divisible by 6.at n=38A309263