OFFSET
1,1
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
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..10000
EXAMPLE
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.
MATHEMATICA
See A072022.
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jun 06 2002
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
STATUS
approved