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

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).

Links

Table of n, a(n) for n=1..26.

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

Cf. A364054, A366470, A366864, A366868.

Sequence in context: A017437 A281264 A372237 * A267103 A030553 A304567

Adjacent sequences: A366866 A366867 A366868 * A366870 A366871 A366872

Keyword

nonn,more

Author

Chai Wah Wu, Oct 25 2023

Status

approved