OFFSET
1,6
FORMULA
a(n) = (2*n-1) - A020900(n). - Michel Marcus, Feb 02 2020
a(n) = n - 1 - A070046(n). - M. F. Hasler, Feb 29 2020
a(n) = A334051(n) - 1. - Alois P. Heinz, Oct 09 2020
PROG
(PARI) a(n) = 2*n - 1 - primepi(2*prime(n)); \\ Michel Marcus, Feb 02 2020
CROSSREFS
KEYWORD
sign
AUTHOR
Todor Szimeonov, Jan 24 2020
STATUS
approved