2222221

Appears in sequences

• Rotating digits of a(n)^2 right once still yields a square.at n=29A045877
• Expansion of e.g.f. sinh(cosh(x)-1), (even terms only).at n=7A059385
• Expansion of g.f. x*(1+10*x)/((1-x)*(1-10*x^2)).at n=13A094623
• Numbers k such that sigma(k) + phi(k) is a repdigit.at n=23A116019
• 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=19A134514
• Second elements of the pairs listed in A134514.at n=9A134585
• a(n) is the number 2 written (prime(n)-1)/2 times followed by the digit 1; a(1)=2.at n=5A137287
• a(n) = (2*10^n - 11)/9.at n=6A165402
• To concatenate all terms, to concatenate the odd rank terms or to concatenate the even rank terms produces the same result.at n=29A299823
• "Wondrous representation" [left to right] of positive integer n, n >= 2.at n=19A303255
• Expansion of x*(1 + 2*x + 10*x^2)/((1 - x^2)*(1 - 10*x^2)).at n=13A322925