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

1,1

Comments

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

Links

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

Example

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

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

Crossrefs

Cf. A000010, A001274, A066418, A066452.

Sequence in context: A016933 A294960 A101959 * A133229 A364615 A161330

Adjacent sequences: A241000 A241001 A241002 * A241004 A241005 A241006

Keyword

nonn

Author

Paolo P. Lava, Aug 07 2014

Status

approved