A358403 The index of A358402 where n first appears, or 0 if n never appears.

1, 3, 6, 9, 25, 21, 17, 109, 198, 67, 860, 114, 148, 261, 57, 137, 82, 37, 52, 215, 447, 43, 105, 404, 267, 163, 414, 94, 154, 1292, 184, 716, 142, 669, 243, 73, 1685, 126, 360, 209, 329, 324, 355, 88, 542, 300, 887, 366, 422, 492, 1053, 1754, 256, 941, 946, 711, 679, 178, 283, 3273, 2221, 225

Offset

0,2

Comments

See A358402 for further details.

Links

Table of n, a(n) for n=0..61.

Prog

(Python)
from itertools import count, islice
def agen():
    k, an, first, prev = 0, 0, {0: 1}, {0: 1}
    for n in count(2):
        while k in first: yield first[k]; k += 1
        an1 = 0 if first[an] == n-1 else min(n-1-prev[an], first[an])
        if an1 not in first: first[an1] = prev[an1] = n
        prev[an] = n-1
        an = an1
print(list(islice(agen(), 62))) # Michael S. Branicky, Nov 14 2022

Crossrefs

Cf. A358402, A358405, A358406, A181391.

Sequence in context: A329863 A026095 A061929 * A318032 A326160 A301536

Adjacent sequences: A358400 A358401 A358402 * A358404 A358405 A358406

Keyword

nonn

Author

Scott R. Shannon, Nov 14 2022

Status

approved