A072023 Values of k such that A072022(k)=0.

13, 31, 70, 119, 189, 210, 235, 236, 265, 301, 303, 317, 345, 352, 366, 448, 470, 472, 479, 498, 500, 511, 520, 546, 557, 562, 572, 578, 580, 624, 674, 682, 691, 724, 740, 747, 768, 784, 808, 815, 876, 878, 880, 948, 957, 964, 981, 990, 995, 998, 1017, 1035, 1044

Offset: 1

Author

Labos Elemer, Jun 06 2002

Keywords

• nonn

Comments

See A074915 for a bound on A048864(x) which allows the establishment of a suitable search range the terms of this sequence. - Giovanni Resta, Feb 25 2020

Examples

			13 is a term because a number whose RRS includes exactly 13 nonprime numbers doesn't exist. Phi(x) - Pi(x) + omega(x) = 13 has no solution.
		

Links

• Giovanni Resta, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A048864, A072022, A074915, A000010, A000720, A001221.

Programs

Mathematica

(* See A072022. *)

Extensions

More terms (search up to 10^6) from Michel Marcus, Aug 08 2019

Terms a(51) and beyond from Giovanni Resta, Feb 25 2020