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A366869
a(n) = A366470(A366864(n)).
1
1, 4, 15, 26, 81, 158, 417, 990, 2491, 6402, 17363, 44450, 119773, 326786, 659957, 1845500, 4779649, 9921002, 27575339, 67458614, 187615521, 515594444, 1433794185, 3989181038, 11160791967, 31287537756
OFFSET
1,2
COMMENTS
Terms of A366470 at the beginning of a segment (except for the first segment).
PROG
(Python)
from itertools import count, islice
from sympy import nextprime
def A366869_gen(): # generator of terms
a, aset, p = 1, {0, 1}, 2
for i in count(3):
for b in count(a, p):
if b not in aset:
aset.add(b)
c = b%(p:=nextprime(p))
if c > a:
yield c
a = c
break
A366869_list = list(islice(A366869_gen(), 20))
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Chai Wah Wu, Oct 25 2023
STATUS
approved