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A366869 a(n) = A366470(A366864(n)).

%I A366869 #9 Oct 26 2023 10:28:52
%S A366869 1,4,15,26,81,158,417,990,2491,6402,17363,44450,119773,326786,659957,
%T A366869 1845500,4779649,9921002,27575339,67458614,187615521,515594444,
%U A366869 1433794185,3989181038,11160791967,31287537756
%N A366869 a(n) = A366470(A366864(n)).
%C A366869 Terms of A366470 at the beginning of a segment (except for the first segment).
%o A366869 (Python)
%o A366869 from itertools import count, islice
%o A366869 from sympy import nextprime
%o A366869 def A366869_gen(): # generator of terms
%o A366869     a, aset, p = 1, {0,1}, 2
%o A366869     for i in count(3):
%o A366869         for b in count(a,p):
%o A366869             if b not in aset:
%o A366869                 aset.add(b)
%o A366869                 c = b%(p:=nextprime(p))
%o A366869                 if c > a:
%o A366869                     yield c
%o A366869                 a = c
%o A366869                 break
%o A366869 A366869_list = list(islice(A366869_gen(), 20))
%Y A366869 Cf. A364054, A366470, A366864, A366868.
%K A366869 nonn,more
%O A366869 1,2
%A A366869 _Chai Wah Wu_, Oct 25 2023