OFFSET
1,1
COMMENTS
Conjecture: The difference between two consecutive terms is 6 at most.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
2 is a divisor of 10 and 10 is not a Zumkeller number, but 2*10 = 20 is a Zumkeller number, therefore 10 is in the sequence.
MATHEMATICA
CROSSREFS
KEYWORD
nonn
AUTHOR
Ivan N. Ianakiev, Apr 17 2020
STATUS
approved