References to A135577

Numbers that have only the digit "1" as first, central and final digit. For numbers with 5 or more digits the rest of digits are "0".
1, 111, 10101, 1001001, 100010001, 10000100001, 1000001000001

1 seqfan posts

Tue Feb 10 17:40:26 CET 2009    [seqfan] A001576

Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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