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A363523 k is a term of this sequence if and only if Clausen(k, 0) divides Clausen(k, 2). (Clausen = A160014.)

%I A363523 #9 Jun 08 2023 08:49:30
%S A363523 1,3,9,15,27,45,75,81,99,105,135,225,243,255,297,315,375,405,495,525,
%T A363523 675,729,735,765,783,891,945,1089,1125,1215,1275,1287,1485,1575,1785,
%U A363523 1875,2025,2115,2187,2205,2295,2349,2415,2475,2625,2673,2835,3267,3375,3465
%N A363523 k is a term of this sequence if and only if Clausen(k, 0) divides Clausen(k, 2). (Clausen = A160014.)
%C A363523 k is a term of A124240 if and only if Clausen(k, 0) divides Clausen(k, 1).
%p A363523 # Using function 'Clausen' from A160014.
%p A363523 aList := m -> select(k -> irem(Clausen(k, 2), Clausen(k, 0)) = 0, [seq(1..m)]):
%p A363523 aList(3500);
%Y A363523 Cf. A160014, A124240.
%K A363523 nonn
%O A363523 1,2
%A A363523 _Peter Luschny_, Jun 08 2023