A348247 Where prime(n) first appears in A307730.

2, 4, 47, 52, 1374, 1385, 3738, 3755, 6680, 6703, 84626, 84657, 89480, 89521, 91832, 91879, 173092, 173151, 192882, 192949, 524587, 524660, 865301, 865384, 876543, 876640, 890479, 890582, 904273, 904382, 918859, 918986, 1628979, 1629116, 1647107, 1647256, 1666775

Offset: 1

Author

N. J. A. Sloane, Oct 17 2021

Keywords

• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..134

Crossrefs

Cf. A307720, A307730, A307632, A348246.

Programs

Python

from collections import Counter
from sympy import prime
def A348247(n):
    c, b, p, i = Counter(), 1, prime(n), 1
    while True:
        k, kb = 1, b
        while c[kb] >= kb:
            k += 1
            kb += b
        if kb == p:
            return i
        c[kb] += 1
        b = k
        i += 1 # Chai Wah Wu, Oct 21 2021

Extensions

More terms from Chai Wah Wu, Oct 21 2021