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A358403
The index of A358402 where n first appears, or 0 if n never appears.
3
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.
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
KEYWORD
nonn
AUTHOR
Scott R. Shannon, Nov 14 2022
STATUS
approved