221911

Appears in sequences

• Expansion of (1 + 2*x^3)/(1 - x - 4*x^7).at n=35A098528
• Numbers k such that k and k^2 use only the digits 1, 2, 3, 4 and 9.at n=24A136972
• Numbers k such that k and k^2 use only the digits 1, 2, 4, 5 and 9.at n=18A136991
• Numbers k such that k and k^2 use only the digits 1, 2, 4, 7 and 9.at n=21A136998
• Numbers k such that k and k^2 use only the digits 1, 2, 4, 8 and 9.at n=35A137000
• Numbers k such that k and k^2 use only the digits 1, 2, 4 and 9.at n=6A137001