A354149 Odd numbers in A090252 in order of appearance.

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

N. J. A. Sloane, Table of n, a(n) for n = 1..9988

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

Cf. A090252, A354146, A354148.

Sequence in context: A323550 A165468 A353124 * A371533 A112372 A082916

Adjacent sequences: A354146 A354147 A354148 * A354150 A354151 A354152

Keyword

nonn

Author

N. J. A. Sloane, May 22 2022

Status

approved