2700000

Appears in sequences

• Denominators of coefficients that satisfy: 3^n = Sum_{k=0..n} c(k)*x^k for n>=0, where c(k) = A107049(k)/a(k).at n=5A107050
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 7 and 9.at n=12A136895
• Numbers k such that k and k^2 use only the digits 0, 2, 6, 7 and 9.at n=26A136923
• Numbers k such that k and k^2 use only the digits 0, 2, 7, 8 and 9.at n=21A136925
• Numbers k such that k and k^2 use only the digits 0, 2, 7 and 9.at n=6A136926
• Numbers n that form a Pythagorean quadruple with n', n'' and sqrt(n^2 + n'^2 + n''^2), where n' and n'' are the first and the second arithmetic derivative of n.at n=13A230543
• Numbers that are highly powerful in Gaussian integers.at n=39A335853