cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A165406 Sequence A165404 shown in binary, or equivalently, sequence A163901 in quaternary base.

Original entry on oeis.org

0, 1, 100, 110, 111, 10000, 10010, 10011, 11000, 11001, 11100, 11110, 11111, 1000000, 1000010, 1000011, 1001000, 1001001, 1001100, 1001110, 1001111, 1100000, 1100001, 1100100, 1100110, 1100111, 1110000, 1110010, 1110011
Offset: 0

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Author

Antti Karttunen, Sep 19 2009

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Crossrefs

a(n) = A007088(A165404(n)) = A007090(A163901(n)). For n>0, A147600(n-1) seems to give the number of terms with n binary digits.

A163901 The positions i where A163355(i) = i, that is, the fixed points of permutation A163355.

Original entry on oeis.org

0, 1, 16, 20, 21, 256, 260, 261, 320, 321, 336, 340, 341, 4096, 4100, 4101, 4160, 4161, 4176, 4180, 4181, 5120, 5121, 5136, 5140, 5141, 5376, 5380, 5381, 5440, 5441, 5456, 5460, 5461, 65536, 65540, 65541, 65600, 65601, 65616, 65620, 65621
Offset: 0

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Author

Antti Karttunen, Sep 19 2009

Keywords

Comments

Alternatively, the positions of zeros in A163900.

Crossrefs

a(n) = A000695(A165404(n)). Same sequence in base-4: A165406. See also A163902, A163903, A163910.

A165403 The positions of zeros in A163898 and A163899.

Original entry on oeis.org

0, 1, 10, 21, 28, 136, 171, 190, 300, 325, 406, 465, 496, 2080, 2211, 2278, 2628, 2701, 2926, 3081, 3160, 4656, 4753, 5050, 5253, 5356, 6328, 6555, 6670, 7260, 7381, 7750, 8001, 8128, 32896, 33411, 33670, 34980, 35245, 36046, 36585, 36856
Offset: 0

Views

Author

Antti Karttunen, Sep 19 2009

Keywords

Comments

Equivalently, the positions of ones in A163904.

Crossrefs

These positions are all in the top row of the said arrays, that is, for all n, A002262(a(n)) = 0. A025581(a(n)) gives A165404.
Showing 1-3 of 3 results.

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