A045764 n + 1 - d(n) - phi(n) never takes these values (conjecture).

2, 13, 67, 93, 123, 133, 141, 173, 187, 193, 205, 217, 229, 245, 253, 257, 283, 285, 293, 303, 317, 319, 325, 333, 341, 389, 393, 397, 405, 415, 427, 445, 453, 467, 473, 483, 491, 493, 509, 525, 527, 533, 537, 549, 557, 571, 573, 581, 587, 589

Offset

1,1

References

R. K. Guy, Unsolved Problems in Number Theory, Springer, 3rd ed. (2004), 101.

Links

Table of n, a(n) for n=1..50.

Crossrefs

Cf. A045763.

Sequence in context: A037752 A037640 A137967 * A106999 A054566 A038144

Adjacent sequences: A045761 A045762 A045763 * A045765 A045766 A045767

Keyword

nonn

Author

Wouter Meeussen

Extensions

Added "conjecture" to title. - Wouter Meeussen, Oct 05 2020

Status

approved