27771

Appears in sequences

• Numbers k such that k and k^2 use only the digits 1, 2, 4, 7 and 8.at n=29A136997
• Number of isomorphism classes of nanocones with 3 pentagons and a nearsymmetric boundary of length n.at n=42A198014
• Number of disconnected regular simple graphs on n vertices with girth exactly 4.at n=24A210714
• Number of nX6 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero.at n=1A232953
• T(n,k)=Number of nXk 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero.at n=22A232955
• Number of 2 X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero.at n=5A232956
• Odd numbers which are factored to the same set of primes in Z as to the irreducible polynomials in GF(2)[X]; odd terms of A235036.at n=29A235039