A259978 Terms in A053177 that are relatively prime to 3.
35, 95, 119, 143, 203, 215, 275, 299, 335, 395, 455, 515, 527, 539, 623, 635, 695, 707, 767, 779, 803, 899, 923, 935, 959, 1007, 1043, 1115, 1127, 1139, 1175, 1199, 1235, 1295, 1355, 1403, 1547, 1595, 1643, 1655, 1679, 1715, 1727, 1763, 1775, 1859, 1883, 1895
Offset: 1
Links
- Lars Blomberg, Table of n, a(n) for n = 1..4332
- R. P. Boas & N. J. A. Sloane, Correspondence, 1974
Crossrefs
Cf. A053177.
Programs
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Mathematica
Select[2 Prime@ Range@ 162 + 1, CompositeQ@ # && GCD[3, #] == 1 &] (* Michael De Vlieger, Jul 13 2015 *)
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PARI
isok(n) = (n % 2) && !isprime(n) && isprime((n-1)/2) && (gcd(n, 3) == 1); \\ Michel Marcus, Jul 28 2018
Formula
a(n) = 2*A275770(n) + 1. - Hilko Koning, Jul 23 2018
Extensions
More terms from Lars Blomberg, Jul 13 2015