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

2, 8, 14, 20, 27, 32, 284, 297, 362, 717, 842, 1322, 1377, 1725, 1802, 1917, 1982, 2222, 2637, 3410, 4094, 4149, 4850, 5288, 5642, 5654, 5660, 5690, 5750, 5937, 5949, 6237, 7017, 7245, 7377, 7490, 8097, 8217, 8277, 8462, 8774, 9117, 9542, 9897, 10034, 11409, 11810

Offset: 1

Author

Paolo P. Lava, Aug 07 2014

Keywords

• nonn

Comments

Like A001274 but using anti-phi, as defined in A066452, instead of phi, per A000010.

Examples

			anti-phi(2) = anti-phi(3) = 1.
anti-phi(8) = anti-phi(9) = 4.
anti-phi(14) = anti-phi(15) = 7. Etc.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..512

Crossrefs

Cf. A000010, A001274, A066418, A066452.

Programs

Maple

for n from 1 do
    if A066452(n) = A066452(n+1) then
        printf("%d,\n",n);
    end if;
end do: # R. J. Mathar, Aug 07 2014