187211

Properties

Appears in sequences

• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, 0, 1), (0, 1, 1), (1, -1, 1), (1, 0, -1)}.at n=9A150563
• Primes of the form 5*p^2+5*p+1, where p is a prime.at n=24A225874
• Number of nX2 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).at n=6A229928
• Number of nX7 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).at n=1A229933
• T(n,k) = Number of n X k 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).at n=29A229934
• T(n,k) = Number of n X k 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).at n=34A229934
• a(n) is the least k such that a k-gon is the first polygon where an agreement of the areas of k-gons inscribed and circumscribed to a unit circle agree with the true value of Pi when truncated to n digits.at n=9A391013
• Prime numbersat n=16939