21263

Appears in sequences

• T(n,n-4), array T as in A038792.at n=27A038794
• Smallest numbers containing exactly n smaller numbers when written as English number names.at n=23A159453
• a(n) is the least number k having exactly n representations as m + sigma(m), where sigma(m) is the sum of the divisors of m.at n=6A186273
• Least number having exactly two odd prime factors that differ by 2*n^2.at n=30A190052
• Number of non-equivalent ways to tile an n X n X n triangular area with two 2 X 2 X 2 triangular tiles and an appropriate number (= n^2-8) of 1 X 1 X 1 tiles.at n=21A286444
• Number of signed trees with n nodes and p positive edges. Triangle T(n,p) read by rows, 0<=p<n.at n=59A302939
• Number of signed trees with n nodes and p positive edges. Triangle T(n,p) read by rows, 0<=p<n.at n=61A302939