A347307 Records in A347113.

1, 4, 10, 22, 46, 94, 118, 166, 334, 358, 718, 1438, 2878, 5758, 8158, 8254, 9838, 19678, 22558, 43198, 56638, 103198, 169438, 184798, 190558, 193918, 274558, 315358, 318238, 357598, 419038, 439678, 486238, 698398, 858238, 1716478, 1723198, 1965118, 2029438, 4058878

Offset: 1

Author

N. J. A. Sloane, Sep 01 2021

Keywords

• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..54

Crossrefs

Cf. A347113, A347306, A347308.

Programs

Python

from math import gcd
A347307_list, nset, m, c, j = [1], {1}, 2, 0, 2
for _ in range(10**4):
    k = m
    while k == j or gcd(k,j) == 1 or k in nset:
        k += 1
    if k > c:
        c = k
        A347307_list.append(k)
    j = k + 1
    nset.add(k)
    while m in nset:
        m += 1 # Chai Wah Wu, Sep 01 2021

Extensions

a(23)-a(40) from Alois P. Heinz, Sep 01 2021