cp's OEIS Frontend

A241003 Numbers k such that anti-phi(k) = anti-phi(k+1).

%I A241003 #18 Jul 19 2022 05:47:47
%S A241003 2,8,14,20,27,32,284,297,362,717,842,1322,1377,1725,1802,1917,1982,
%T A241003 2222,2637,3410,4094,4149,4850,5288,5642,5654,5660,5690,5750,5937,
%U A241003 5949,6237,7017,7245,7377,7490,8097,8217,8277,8462,8774,9117,9542,9897,10034,11409,11810
%N A241003 Numbers k such that anti-phi(k) = anti-phi(k+1).
%C A241003 Like A001274 but using anti-phi, as defined in A066452, instead of phi, per A000010.
%H A241003 Amiram Eldar, <a href="/A241003/b241003.txt">Table of n, a(n) for n = 1..512</a>
%e A241003 anti-phi(2) = anti-phi(3) = 1.
%e A241003 anti-phi(8) = anti-phi(9) = 4.
%e A241003 anti-phi(14) = anti-phi(15) = 7. Etc.
%p A241003 for n from 1 do
%p A241003     if A066452(n) = A066452(n+1) then
%p A241003         printf("%d,\n",n);
%p A241003     end if;
%p A241003 end do: # _R. J. Mathar_, Aug 07 2014
%Y A241003 Cf. A000010, A001274, A066418, A066452.
%K A241003 nonn
%O A241003 1,1
%A A241003 _Paolo P. Lava_, Aug 07 2014