206020

Appears in sequences

• a(n) is the index of the smallest triangular number containing exactly n 2's.at n=6A048357
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 6.at n=31A136883
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 6.at n=8A136902
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 7.at n=22A136903
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 8.at n=54A136904
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 9.at n=31A136905