82000

Appears in sequences

• Numbers that define integer Heronian triangles [a(n), prime(a(n)), A068968(n)] with area A068969(n).at n=44A068967
• Numbers that define integer Heronian triangles [a(n), prime(a(n)), A068968(n)] with area A068969(n).at n=45A068967
• a(1)=1, a(n) = n*a(floor(n/2)).at n=40A098844
• Numbers that can be written in bases 2, 3, 4, and 5 using only the digits 0 and 1.at n=2A146025
• a(n) = floor(p/2) * floor(floor(p/2)/2) * floor(floor(floor(p/2)/2)/2) * ... * 1, where p=prime(n).at n=22A163467
• Numbers n such that phi(n)/n = 16/41.at n=21A176598
• Number of 6-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=23A187380
• Smallest number > 1 whose representation in all bases up to n consists only of 0's and 1's.at n=3A258107
• Numbers containing only 1's and 0's in their base-2, base-3, and base-4 representations.at n=26A258981
• Numbers whose base-4 and base-5 representations have only 0's and 1's.at n=6A263684
• Numbers which have only digits 0 and 1 in bases 3 and 5.at n=13A268337
• Number of Dyck paths of semilength n such that each positive level has exactly three peaks.at n=18A288319