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A354149
Odd numbers in A090252 in order of appearance.
2
1, 3, 5, 7, 9, 11, 13, 17, 19, 23, 25, 21, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 55, 79, 27, 49, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 85, 121, 223, 227, 57, 229, 161, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331
OFFSET
1,2
LINKS
PROG
(Python)
from math import gcd, prod
from itertools import count, islice
def agen(): # generator of terms
alst, aset, mink = [1], {1}, 2; yield 1
for n in count(2):
k, s = mink, n - n//2
prodall = prod(alst[n-n//2-1:n-1])
while k in aset or gcd(prodall, k) != 1: k += 1
alst.append(k); aset.add(k)
if k%2 == 1: yield k
while mink in aset: mink += 1
print(list(islice(agen(), 77))) # Michael S. Branicky, May 23 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 22 2022
STATUS
approved