22262

Appears in sequences

• Numbers having four 2's in base 10.at n=20A043500
• G.f. satisfies A(x) = 1 + x (1+Sum_{n=0..inf} [xA(x)]^(2^n)).at n=15A075853
• Near-repdigit semiprimes with 2 as repeated digit.at n=17A105983
• Semiprimes of the form 2*(m^2 + m + 1) (implying that m^2 + m + 1 is a prime).at n=33A107317
• Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 9.at n=10A137096
• Numbers k such that A(k+1) = A(k) + 1, where A() = A005101() are the abundant numbers.at n=24A169822
• Number of (n+2) X 3 0..2 arrays with every 3 X 3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.at n=2A204146
• Number of (n+2)X5 0..2 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.at n=0A204148
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.at n=3A204153
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.at n=5A204153
• Numbers n with digits 2 and 6 only.at n=32A284632
• Number of bifurcating nodes at generation n in the binary tree of persistently squarefree numbers (see A293230).at n=35A293522
• Expansion of e.g.f. Product_{k>=1} ((1 + (exp(x) - 1)^k) / (1 - (exp(x) - 1)^k))^k.at n=5A306081
• E.g.f.: Product_{k>=1} (1 + k*(exp(x)-1)^k) / (1 - k*(exp(x)-1)^k).at n=5A326886