Number of tripling steps to reach 1 in the 3x+1 (Collatz) problem starting with the n-th Mersenne prime.

A390817

Number of tripling steps to reach 1 in the 3x+1 (Collatz) problem starting with the n-th Mersenne prime.

Terms

    a(0) =2a(1) =5a(2) =39a(3) =15a(4) =56a(5) =80a(6) =61a(7) =162a(8) =309a(9) =528a(10) =516a(11) =593a(12) =2417a(13) =3051a(14) =6118a(15) =10684a(16) =11007a(17) =15575a(18) =19982a(19) =21777a(20) =46391a(21) =48126a(22) =55046a(23) =95136a(24) =105015a(25) =111783a(26) =214150a(27) =414951a(28) =530772a(29) =634078

External references