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%I #29 Aug 06 2018 05:30:39
%S 35,95,119,143,203,215,275,299,335,395,455,515,527,539,623,635,695,
%T 707,767,779,803,899,923,935,959,1007,1043,1115,1127,1139,1175,1199,
%U 1235,1295,1355,1403,1547,1595,1643,1655,1679,1715,1727,1763,1775,1859,1883,1895
%N Terms in A053177 that are relatively prime to 3.
%H Lars Blomberg, <a href="/A259978/b259978.txt">Table of n, a(n) for n = 1..4332</a>
%H R. P. Boas & N. J. A. Sloane, <a href="/A005381/a005381.pdf">Correspondence, 1974</a>
%F a(n) = 2*A275770(n) + 1. - _Hilko Koning_, Jul 23 2018
%t Select[2 Prime@ Range@ 162 + 1, CompositeQ@ # && GCD[3, #] == 1 &] (* _Michael De Vlieger_, Jul 13 2015 *)
%o (PARI) isok(n) = (n % 2) && !isprime(n) && isprime((n-1)/2) && (gcd(n, 3) == 1); \\ _Michel Marcus_, Jul 28 2018
%Y Cf. A053177.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 12 2015, following a suggestion from R. P. Boas, May 19 1974
%E More terms from _Lars Blomberg_, Jul 13 2015
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