18796

Appears in sequences

• Successively larger gaps in Ulam numbers start at this Ulam number.at n=17A080287
• 4 times 9-gonal numbers: a(n) = 2*n*(7*n-5).at n=37A152760
• 1/16 the number of (n+1) X 5 0..3 arrays with all 2 X 2 subblocks having the same four values.at n=11A184034
• Number of length-n 0..2 arrays with no adjacent pair x,x+1 followed at any distance by x+1,x.at n=9A268451
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = 1, a(1) = 3, a(2) = 5, a(3) = 7.at n=19A295717
• Numbers k such that k*A001414(k)+1 is the square of a prime.at n=21A343141