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%I #12 Sep 11 2019 08:19:20
%S 1,3,7,9,21,27,49,57,63,81,147,171,189,219,243,301,343,399,441,513,
%T 567,657,729,889,903,1029,1083,1197,1323,1533,1539,1701,1971,2107,
%U 2187,2359,2401,2667,2709,2793,3087,3249,3591,3969,4161,4401,4599,4617,5103,5913
%N A014741(n)/6 for n>2.
%C A014741(n) is divisible by 6 for n>2.
%C All powers of 3 are terms. All powers of 7 are terms. The prime divisors of terms of this sequence (for n up to 10^6) in order of their first appearance are 3, 7, 19, 73, 43, 127, 337, 163, 379, 571, 5419, 487, 2593, 439, 1459, 431, 883.
%C The sequence is multiplicative in the sense that if two numbers k and m are terms, then k*m is too.
%H Amiram Eldar, <a href="/A125227/b125227.txt">Table of n, a(n) for n = 3..10000</a>
%F a(n) = A014741(n)/6 = A014945(n-1)/3. - _Max Alekseyev_, Nov 14 2012
%e a(3) = A014741(3)/6 = 6/6 = 1.
%e a(4) = A014741(4)/6 = 18/6 = 3.
%t Select[Range[3,6000], PowerMod[2,#+1,# ]==2&]/6
%Y Cf. A014741, A000295, A086787.
%K nonn
%O 3,2
%A _Alexander Adamchuk_, Jan 15 2007
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