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COMMENTS
| a(n) is a subset of A014945(n) = {1, 3, 9, 21, 27, 63, 81, 147, 171, 189, 243, 441, 513, 567, 657, 729, ...} Numbers n such that n divides 4^n-1.
3 divides a(n) for n>1. 7 divides a(n) for n>2. 43 divides a(n) for n = {4,8,9,10,12,13,16,...}. 127 divides a(n) for n = {5,8,11,14,15,17,...}. Prime factors of a(n) in order of their appearance in a(n) are {3,7,43,127,337,5419,431,1033,5419,2287,3049,9719,...}. - Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 11 2007
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