Smallest natural number requiring n applications of the map x -> 2^x mod x = A015910(x) to reach 0.

Terms

a(0) =0a(1) =1a(2) =3a(3) =18a(4) =35a(5) =207a(6) =774a(7) =1513a(8) =2051a(9) =8900a(10) =13459a(11) =25907a(12) =34305a(13) =88036a(14) =153839a(15) =382283a(16) =397590a(17) =636459a(18) =844177a(19) =1456073a(20) =2426735a(21) =7312307a(22) =11716125a(23) =14657311a(24) =43165242a(25) =52706549a(26) =84955821a(27) =188736643a(28) =416569989a(29) =953350161