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A364874
A packing coloring for the one-way infinite path using only the first 8 prime numbers.
0
2, 3, 5, 2, 7, 3, 2, 11, 5, 2, 3, 13, 2, 7, 3, 2, 5, 17, 2, 3, 11, 2, 5, 3, 2, 7, 13, 2, 3, 5, 2, 19, 3, 2, 7, 5, 2, 3, 11, 2, 13, 3, 2, 5, 7, 2, 3, 17, 2, 5, 3, 2, 7, 11, 2, 3, 5, 2, 13, 3, 2, 7, 5, 2, 3, 11, 2, 17, 3, 2, 5, 7, 2, 3, 13, 2, 5, 3, 2, 7, 11, 2, 3, 5, 2, 17, 3, 2
OFFSET
1,1
COMMENTS
a(1)=2; for n > 1, a(n) is the smallest number in the set S = {2,3,5,7,11,13,17,19}, subject to the constraint that for m < n, if a(m) = a(n) = s_i, n-m > s_i.
Observations:
The sequence is eventually periodic after the 129th term, with the repetend being the last 54 terms provided above. The repetend itself, repeated periodically, is also a packing coloring for the one-way and two-way infinite paths using this set S.
The chromatic number for packing the two-way infinite path with primes may be 8.
CROSSREFS
Sequence in context: A066949 A073481 A178094 * A122556 A175723 A084346
KEYWORD
easy,nonn
AUTHOR
Kenneth A. Dennison, Aug 11 2023
STATUS
approved