122222222

Appears in sequences

• Number of nodes on a tree with degree 11 interior nodes and degree 1 boundary nodes.at n=8A090843
• Expansion of g.f. x*(1+11*x+x^2)/((1-x)*(1+x)*(1-10*x^2)).at n=17A094624
• Expansion of x*(1+x)/((1-x)*(1-10*x^2)).at n=17A094626
• Smallest semiprime containing exactly n 2's.at n=7A104669
• Smallest semiprime ending in exactly n 2's.at n=7A106657
• Base 3 representation of the positive integers n such that Sum[d[k],k=1..n] is an integer, where d(k) is the base 3 fraction 0.k (e.g., d(22 base 10)=d(211 base 3)=0.221 base 3).at n=11A107483
• 1 followed by 2n 2's.at n=4A131970
• List of pairs (n,m) with n < m such that the decimal expansion of m is a cyclic shift of that of n and m^2 is a cyclic shift of n^2.at n=24A134514
• First elements of the pairs listed in A134514.at n=12A134584
• Let f(m) put the leftmost digit of the positive integer m at its end; a(n) is the sequence of all positive integers m with f^2(m)=f(m^2).at n=10A245584