195625

Appears in sequences

• a(n) = (5^n + 5^floor(n/2))/2.at n=8A001447
• Number of reversible strings with n beads of 5 colors.at n=8A032122
• a(n) = n^2*(n^2 + 1)/2.at n=25A037270
• a(n) = (n^8 + n^4)/2.at n=5A071231
• Row sums of the triangle A045975.at n=24A204558
• Number of 2 X 2 matrices with all terms in {0,1,...,n} and even trace.at n=24A210378
• Numbers k such that k = n-th triangular number and last digits of k match n.at n=3A219253
• Triangular numbers of the form p*w, where p is a prime number and w is a prime power (A025475).at n=22A225674
• Triangular numbers that are the product of a square number and a prime number.at n=26A253653
• a(n) = (n^2 + (n+1)^2)*(n^2 + (n+1)^2 + 2*n*(n+1)).at n=12A272850
• Odd numbers k such that A173557(k) divides nonzero A051709(k).at n=10A345054
• Triangular numbers that are sum of squares of two distinct triangular numbers.at n=30A346386
• Triangular numbers with exactly 10 divisors.at n=3A349699