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A278942
Between two successive digits "7" there are 0, then 1, then 2, then 3, ... other digits.
1
0, 1, 2, 3, 4, 5, 6, 7, 70, 71, 8, 72, 9, 17, 10, 11, 73, 12, 13, 74, 14, 15, 27, 16, 18, 19, 37, 20, 21, 22, 23, 75, 24, 25, 26, 28, 76, 29, 30, 31, 32, 47, 33, 34, 35, 36, 38, 57, 39, 40, 41, 42, 43, 44, 78, 45, 46, 48, 49, 50, 51, 79, 52, 53, 54, 55, 56, 58, 67, 59, 60, 61, 62, 63, 64, 65, 87, 66, 68, 69, 80, 81, 82, 83, 84, 700, 85, 86, 88, 89, 90, 91, 92, 97, 93, 94, 95, 96, 98, 99, 100, 101, 701, 102, 103, 104, 105, 106, 107, 108, 109
OFFSET
1,3
COMMENTS
The sequence starts with a(1) = 0 and is always extended with the smallest integer not yet present that does not lead to a contradiction.
LINKS
EXAMPLE
There are 0 digit between "7" and "70"; there is 1 digit between the "7" of "70" and the "7" of "71" (this is the "0" of "70"); there are 2 digits between the "7" of "71" and the "7" of "72" (they are the "1" of "71" and the "8" of "8"); there are 3 digits between the "7" of "72" and the "7" of "17" (they are the "2" of "72", the "9" of "9" and the "1" of "17"); etc.
CROSSREFS
Sequence in context: A044909 A370776 A273475 * A303166 A024649 A037335
KEYWORD
nonn,base
AUTHOR
STATUS
approved