a(n) is the smallest composite k such that k divides 2^(k*n-1) - 1.

Terms

a(0) =341a(1) =80519a(2) =15a(3) =511a(4) =65a(5) =42671a(6) =15a(7) =161a(8) =445a(9) =35551a(10) =15a(11) =2047a(12) =85a(13) =80129a(14) =15a(15) =1561a(16) =33a(17) =190679a(18) =15a(19) =983927a(20) =85a(21) =511a(22) =15a(23) =11303a(24) =345a(25) =2201a(26) =15a(27) =217a(28) =65a(29) =188393