a(n) begins the first chain of n consecutive positive integers that have equal h-values, where h(k) is the length of the finite sequence k, f(k), f(f(k)), ...., 1 in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)

A078441

a(n) begins the first chain of n consecutive positive integers that have equal h-values, where h(k) is the length of the finite sequence k, f(k), f(f(k)), ...., 1 in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)

Terms

    a(0) =1a(1) =12a(2) =28a(3) =98a(4) =98a(5) =386a(6) =943a(7) =1494a(8) =1680a(9) =2987a(10) =2987a(11) =2987a(12) =2987a(13) =2987a(14) =7083a(15) =7083a(16) =7083a(17) =57346a(18) =57346a(19) =57346a(20) =57346a(21) =57346a(22) =57346a(23) =57346a(24) =57346a(25) =252548a(26) =252548a(27) =331778a(28) =331778a(29) =524289

External references