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A352387
Lexicographically earliest sequence of distinct positive integers such that the first digit of |a(n) - a(n+1)| is the n-th digit of the sequence (integers including a zero are excluded).
4
1, 2, 4, 8, 16, 3, 9, 6, 15, 21, 5, 55, 26, 7, 12, 17, 22, 24, 18, 11, 23, 25, 13, 83, 54, 27, 29, 33, 14, 94, 75, 56, 28, 31, 51, 46, 32, 35, 43, 73, 19, 59, 34, 41, 39, 48, 45, 42, 52, 92, 182, 133, 57, 62, 67, 61, 36, 44, 47, 37, 87, 68, 64, 58, 88, 63, 66, 71, 111, 72, 65, 95, 76, 85, 135, 38, 69, 112
OFFSET
1,2
EXAMPLE
|a(1) - a(2)| = |1 - 2| = 1 and the initial 1 of 1 is the 1st digit of the sequence;
|a(2) - a(3)| = |2 - 4| = 2 and the initial 2 of 2 is the 2nd digit of the sequence;
|a(3) - a(4)| = |4 - 8| = 4 and the initial 4 of 4 is the 3rd digit of the sequence;
|a(4) - a(5)| = |8 - 16| = 8 and the initial 8 of 8 is the 4th digit of the sequence;
|a(5) - a(6)| = |16 - 3| = 13 and the initial 1 of 13 is the 5th digit of the sequence; etc.
CROSSREFS
Cf. A352386.
Sequence in context: A331440 A247243 A341819 * A110001 A302030 A167426
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Mar 14 2022
STATUS
approved