A374991 Lexicographically earliest sequence of distinct nonnegative integers such that the concatenation of the binary expansions of two consecutive terms, in at least one way, and after removal of trailing digits, is palindromic.
0, 1, 2, 3, 4, 7, 6, 11, 5, 10, 8, 13, 16, 15, 12, 19, 9, 18, 36, 32, 22, 26, 23, 14, 28, 31, 24, 29, 46, 58, 47, 20, 37, 41, 74, 72, 39, 25, 38, 50, 76, 51, 102, 103, 57, 48, 54, 27, 44, 52, 75, 82, 64, 42, 21, 43, 53, 86, 40, 45, 80, 89, 77, 144, 79, 60, 30
Offset: 0
Examples
The first terms, in decimal and in binary, alongside an appropriate palindrome (with dots denoting the removed trailing zeros), are: n a(n) bin(a(n)) palindrome -- ---- --------- ---------- 0 0 0 1 1 1 1 11. 2 2 10 111. 3 3 11 111.. 4 4 100 1111.. 5 7 111 11111. 6 6 110 1101011 7 11 1011 1011101 8 5 101 101101. 9 10 1010 10101... 10 8 1000 11011... 11 13 1101 11011.... 12 16 10000 11111....
Links
- Rémy Sigrist, PARI program
Programs
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PARI
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