2125762

Appears in sequences

• Least x>=3 such that F(x)==1 (mod 3^n) where F(x) denotes the x-th Fibonacci number (A000045).at n=13A079004
• Number of palindromes (in base 3) below 3^n.at n=25A117862
• a(n) is the smallest positive integer k such that for all x >= k, at least 50% of the integers in the range 1..x contain n in their decimal expansion. In other words, it is the largest integer k such that exactly half of the integers 1..k have n in their decimal expansion.at n=2A346685
• Records in the trajectory of all positive integers in the 3x+1 or Collatz problem, including the trajectory [1, 4, 2, 1] of 1.at n=42A347652
• Numbers of the form 4u+2 in A351551.at n=8A351550