OFFSET
1,1
COMMENTS
A006039 lists the primitive nondeficient numbers.
LINKS
David A. Corneth, Table of n, a(n) for n = 1..10000
David A. Corneth, PARI program
FORMULA
Numbers k such that A337690(k) >= 3.
EXAMPLE
Table of n, a(n) and the relevant divisors starts:
n a(n) divisors in A006039
1 140 20, 28, 70;
2 280 20, 28, 70;
3 420 6, 20, 28, 70;
4 560 20, 28, 70;
5 700 20, 28, 70;
6 840 6, 20, 28, 70;
7 980 20, 28, 70;
8 1120 20, 28, 70;
9 1144 88, 104, 572;
10 1260 6, 20, 28, 70;
11 1320 6, 20, 88;
12 1400 20, 28, 70;
PROG
(PARI) See Corneth link \\ David A. Corneth, Oct 07 2020
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved