1222222

Appears in sequences

• Numbers k such that rotating digits of k^2 left once still yields a square.at n=26A045878
• Number of nodes on a tree with degree 11 interior nodes and degree 1 boundary nodes.at n=6A090843
• Expansion of g.f. x*(1+11*x+x^2)/((1-x)*(1+x)*(1-10*x^2)).at n=13A094624
• Expansion of x*(1+x)/((1-x)*(1-10*x^2)).at n=13A094626
• Smallest semiprime containing exactly n 2's.at n=5A104669
• Smallest semiprime ending in exactly n 2's.at n=5A106657
• 1 followed by 2n 2's.at n=3A131970
• 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=18A134514
• First elements of the pairs listed in A134514.at n=9A134584
• Generalized Lucas-Pascal triangle; (11*10^n, 1).at n=29A164851
• Numbers with n digits from the set {1,2,4}, requiring a nondecreasing sequence of digits and a digits sum of A008578(n).at n=6A166747
• 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=8A245584
• "Wondrous representation" [right to left] of positive integer n, n >= 2.at n=19A303433