18641

Appears in sequences

• Denominators of convergents to the comma of Pythagoras.at n=9A046102
• Numbers n such that mu(n) + mu(n+1) + mu(n+2) + mu(n+3) + mu(n+4) + mu(n+5) + mu(n+6) = 6.at n=15A082967
• Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 1 X 5 or 5 X 1 block.at n=22A145969
• Number of nondecreasing arrangements of 7 numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*x(i)^2 zero.at n=10A188007
• Number of days after Jan 01 1000 such that the date written in the format DDMMYYYY is palindromic.at n=17A210885