1212415

Appears in sequences

• In the '3x+1' problem, these values for the starting value set new records for highest point of trajectory before reaching 1.at n=26A006884
• '3x+1' record-setters (blowup factor).at n=15A025587
• a(n) = 37*2^(n-1)-1.at n=15A171390
• Antidiagonal sums of the convolution array A213566.at n=19A213570
• Least number whose Collatz (3x+1) trajectory has a number greater than 10^n.at n=11A222291
• Least number whose Collatz 3x+1 trajectory contains a number >= 2^n.at n=37A222292
• a(n) = 2*a(n-1) + 1 for a(n-1) not prime, otherwise a(n) = prime(n) - 1; with a(1) = 147.at n=13A375155