87800

Appears in sequences

• Numbers k such that k and k^2 use only the digits 0, 1, 4, 7 and 8.at n=17A136864
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 7 and 8.at n=47A136906
• Numbers k such that k and k^2 use only the digits 0, 3, 4, 7 and 8.at n=6A136933
• Numbers k such that k and k^2 use only the digits 0, 4, 5, 7 and 8.at n=12A136951
• Numbers k such that k and k^2 use only the digits 0, 4, 6, 7 and 8.at n=20A136954
• Numbers k such that k and k^2 use only the digits 0, 4, 7 and 8.at n=6A136958
• Numbers k such that k and k^2 use only the digits 0, 4, 7, 8 and 9.at n=30A136959
• a(n) = (n^4 + 2*n^3 - n^2)/2.at n=20A255499