OFFSET
1,2
COMMENTS
a(n) = least positive integer > a(n-1) and not equal to a(i)+a(j)-a(k) for distinct i and j with 1 <= i,j,k <= n-1. [Comment corrected by Jean-Paul Delahaye, Oct 02 2020.]
LINKS
Klaus Brockhaus and Dan Hoey, Table of n, a(n) for n = 1..2839
FORMULA
a(n) = A010672(n-1)+1.
PROG
(Python)
from itertools import islice
def agen(): # generator of terms
aset, sset, k = set(), set(), 0
while True:
k += 1
while any(k+an in sset for an in aset): k += 1
yield k; sset.update(k+an for an in aset); aset.add(k)
print(list(islice(agen(), 51))) # Michael S. Branicky, Feb 05 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved