Least positive number k such that 2^k mod k = 2n+1, or 0 if no such k exists.

Terms

a(0) =0a(1) =4700063497a(2) =19147a(3) =25a(4) =2228071a(5) =262279a(6) =95a(7) =481a(8) =45a(9) =2873a(10) =3175999a(11) =555a(12) =95921a(13) =174934013a(14) =777a(15) =140039a(16) =2463240427a(17) =477a(18) =91a(19) =623a(20) =2453a(21) =55a(22) =345119a(23) =1131a(24) =943a(25) =21967a(26) =135a(27) =46979a(28) =125a(29) =3811