540000

Appears in sequences

• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*10^j.at n=24A038228
• Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*6^j.at n=24A038248
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*5^j.at n=24A038259
• Triangle whose (i,j)-th entry is binomial(i,j)*10^(i-j)*3^j.at n=24A038305
• Powerful(1) numbers (A001694) whose digit reversal is a triangular number.at n=7A115691
• Number of permutations of 9 indistinguishable copies of 1..n arranged in a circle with exactly 1 local maximum.at n=4A159740
• Number of n-cycles on the graph of the regular 120-cell, 3 <= n <= 600.at n=12A167984
• Number of palindromic paths through the subset array of {1,2,...,n}; see Comments.at n=5A208654
• a(n) = phi(n^5 - 1)/5 where phi is A000010.at n=18A319214
• Numbers that are highly powerful in Gaussian integers.at n=33A335853
• Cubefull numbers with more than 2 distinct prime factors.at n=22A391755