cp's OEIS Frontend

A373837 Numbers k such that bigomega(k) and A276085(k) are both multiples of 3, where bigomega (A001222) and A276085 are fully additive with a(p) = 1 and a(p) = p#/p respectively.

%I A373837 #7 Jun 19 2024 23:40:02
%S A373837 1,8,27,30,42,64,66,78,102,114,125,138,174,175,186,216,222,240,245,
%T A373837 246,258,275,282,318,325,336,343,354,366,385,402,425,426,438,455,474,
%U A373837 475,498,512,528,534,539,575,582,595,605,606,618,624,637,642,654,665,678,715,725,729,762,775,786,805,810,816,822,833
%N A373837 Numbers k such that bigomega(k) and A276085(k) are both multiples of 3, where bigomega (A001222) and A276085 are fully additive with a(p) = 1 and a(p) = p#/p respectively.
%C A373837 Because A145784 and A339746 are both multiplicative semigroups (as A001222 and A276085 are completely additive), this is also: if m and n are in the sequence then so is m*n.
%H A373837 Antti Karttunen, <a href="/A373837/b373837.txt">Table of n, a(n) for n = 1..12000</a>
%o A373837 (PARI) isA373837 = A373836;
%Y A373837 Cf. A001222, A276085, A373836 (characteristic function).
%Y A373837 Intersection of A145784 and A339746.
%K A373837 nonn
%O A373837 1,2
%A A373837 _Antti Karttunen_, Jun 19 2024