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A338380
Replace every term a(n) by the pair [a(n), a(n)] to form a new sequence S: S is the succession of the absolute differences of the starting sequence.
1
1, 2, 3, 5, 7, 10, 13, 18, 23, 16, 9, 19, 29, 42, 55, 73, 91, 68, 45, 61, 77, 86, 95, 114, 133, 104, 75, 117, 159, 214, 269, 342, 415, 324, 233, 165, 97, 142, 187, 248, 309, 232, 155, 241, 327, 422, 517, 631, 745, 612, 479, 375, 271, 196, 121, 238, 355, 514, 673, 887, 1101, 832, 563, 905, 1247, 1662, 2077
OFFSET
1,2
COMMENTS
This is the lexicographically earliest sequence of distinct positive terms with this property.
LINKS
EXAMPLE
The successive absolute differences between two successive terms are 1, 1, 2, 2, 3, 3, 5, 5, 7, 7, 10, 10, 13, 13, 18, 18, 23, 23, 16, 16, 9, 9,... which is the sequence itself with every term duplicated.
CROSSREFS
Cf. A033485 (same sequence, but strictly monotonically increasing).
Sequence in context: A319470 A115001 A349060 * A309408 A347647 A008766
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Nov 05 2020
STATUS
approved