cp's OEIS Frontend

A343047 a(n) = A343046(n, n).

%I A343047 #12 Apr 08 2021 00:34:17
%S A343047 0,1,6,9,12,15,210,217,246,249,252,255,420,427,456,459,492,495,630,
%T A343047 637,666,669,702,705,840,847,876,879,912,915,30030,30061,30246,30279,
%U A343047 30252,30285,32550,32587,32586,32589,32592,32595,32760,32797,32796,32799,32832
%N A343047 a(n) = A343046(n, n).
%C A343047 This sequence has similarities with A087019 and A343043.
%H A343047 Rémy Sigrist, <a href="/A343047/b343047.txt">Table of n, a(n) for n = 0..10000</a>
%H A343047 Rémy Sigrist, <a href="/A343047/a343047.gp.txt">PARI program for A343047</a>
%H A343047 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a>
%H A343047 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>
%F A343047 a(A002110(k)) = A002110(2*k) for any k >= 0.
%F A343047 a(A143293(k)) = A143293(2*k) for any k >= 0.
%e A343047 For n = 2:
%e A343047 - the primorial base representation of 2 is "10", so:
%e A343047          1 0
%e A343047        x 1 0
%e A343047        -----
%e A343047          0 0
%e A343047      + 1 0
%e A343047      -------
%e A343047        1 0 0
%e A343047 - hence a(2) = 2*3 = 6.
%o A343047 (PARI) See Links section.
%Y A343047 Cf. A002110, A143293, A343046.
%Y A343047 Cf. A087019, A343043.
%K A343047 nonn,base
%O A343047 0,3
%A A343047 _Rémy Sigrist_, Apr 05 2021