

A347024


There are a(n) digits between a(n) and the next copy of the string a(n) read backwards. This is the lexicographically earliest sequence of distinct positive terms with this property.


0



1, 2, 10, 20, 3, 4, 7, 8, 30, 400, 17, 5, 80, 9, 6, 15, 100, 26, 19, 11, 27, 16, 18, 51, 40, 31, 12, 21, 29, 13, 61, 62, 81, 210, 72, 22, 310, 41, 23, 28, 71, 34, 49, 200, 46, 33, 220, 91, 50, 53, 24, 60, 83, 820, 35, 25, 37, 143, 116, 32, 633, 42, 1000, 194, 64, 45, 270, 218, 65, 305, 117, 352, 36, 14
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OFFSET

1,2


LINKS



EXAMPLE

a(1) = 1; there is 1 digit between a(1) and the "1" of 10: this is the digit 2;
a(2) = 2; there are 2 digits between a(2) and the "2" of 20: they are 1 and 0;
a(3) = 10; there are 10 digits between a(3) and the next string "01" (formed by the terms "400, 17"): they are 2, 0, 3, 4, 7, 8, 3, 0, 4 and 0;
a(4) = 20; there are 20 digits between a(4) and the next string "02" (formed by the terms "100, 26"): they are 3, 4, 7, 8, 3, 0, 4, 0, 0, 1, 7, 5, 8, 0, 9, 6, 1, 5, 1 and 0;
a(5) = 3; there are 3 digits between a(5) and the "3" of 30: they are 4, 7 and 8;
a(6) = 4; there are 4 digits between a(6) and the "4" of 400: they are 7, 8, 3 and 0;
a(7) = 7; there are 7 digits between a(7) and the "7" of 17: they are 8, 3, 0, 4, 0, 0 and 1; etc.


CROSSREFS



KEYWORD

base,nonn


AUTHOR



STATUS

approved



