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A347835
Lexicographically earliest sequence of distinct terms > 0 such that the a(a(n))-th digit of S is the n-th digit of Pi.
1
2, 3, 10, 6, 11, 9, 94, 5, 14, 50, 18, 51, 8, 23, 70, 22, 1, 30, 32, 80, 36, 60, 35, 13, 28, 34, 17, 38, 380, 47, 57, 90, 4, 21, 20, 43, 45, 7, 79, 54, 12, 76, 81, 949, 84, 91, 41, 56, 590, 120, 15, 39, 49, 25, 24, 99, 68, 53, 101, 59, 64, 71, 106, 26, 44, 29, 69, 77, 16, 89, 66, 33, 108, 31, 82, 117, 42
OFFSET
1,1
EXAMPLE
The 2nd digit of S is 3 and if n = 1 then a(1) = 2 and a(a(1)) = 3.
The 3rd digit of S is 1 and if n = 2 then a(2) = 3 and a(a(2)) = 1.
The 10th digit of S is 4 and if n = 3 then a(3) = 10 and a(a(3)) = 4.
The 6th digit of S is 1 and if n = 4 then a(4) = 6 and a(a(4)) = 1.
The 11th digit of S is 5 and if n = 5 then a(5) = 11 and a(a(5)) = 5.
The 9th digit of S is 9 and if n = 6 then a(6) = 94 and a(a(6)) = 9.
The 94th digit of S is 2 and if n = 7 then a(7) = 5 and a(a(7)) = 2, etc.
We see above that the leftmost column of integers forms the sequence S and the rightmost column of digits forms the successive digits of Pi.
CROSSREFS
Cf. A000796.
Sequence in context: A163767 A343936 A336091 * A128531 A123167 A333176
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Sep 21 2021
STATUS
approved