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.

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A361401 Irregular table T(n, k), n >= 0, k = 1..A361398(n); the n-th row lists the numbers whose binary expansion is a self-infiltration of that of n.

Original entry on oeis.org

0, 1, 3, 2, 4, 6, 10, 12, 3, 7, 15, 4, 8, 12, 16, 20, 24, 36, 40, 48, 5, 9, 11, 13, 19, 21, 25, 27, 43, 45, 51, 53, 6, 12, 14, 26, 28, 30, 54, 58, 60, 7, 15, 31, 63, 8, 16, 24, 32, 40, 48, 64, 72, 80, 96, 136, 144, 160, 192
Offset: 0

Views

Author

Rémy Sigrist, Mar 10 2023

Keywords

Comments

See A361398 for the definition of an infiltration (a self-infiltration is an infiltration a of word with itself).
The terms of the n-th row of A358893 appear in the n-th row of the present table (they correspond to terms with twice as many binary digits as n).

Examples

			Table T(n, k) begins:
  n  n-th row
  -  ---------------------------------------------------------
  0  0
  1  1, 3
  2  2, 4, 6, 10, 12
  3  3, 7, 15
  4  4, 8, 12, 16, 20, 24, 36, 40, 48
  5  5, 9, 11, 13, 19, 21, 25, 27, 43, 45, 51, 53
  6  6, 12, 14, 26, 28, 30, 54, 58, 60
  7  7, 15, 31, 63
  8  8, 16, 24, 32, 40, 48, 64, 72, 80, 96, 136, 144, 160, 192
		

Crossrefs

Programs

  • PARI
    See Links section.

Formula

T(n, 1) = 1.
T(n, A361398(n)) = A330941(n).

A358892 Numbers obtained by self-shuffling the binary expansion of nonnegative numbers.

Original entry on oeis.org

0, 3, 10, 12, 15, 36, 40, 43, 45, 48, 51, 53, 54, 58, 60, 63, 136, 144, 147, 149, 153, 160, 163, 165, 169, 170, 172, 175, 178, 180, 183, 187, 192, 195, 197, 201, 202, 204, 207, 210, 212, 215, 216, 219, 221, 228, 232, 235, 237, 238, 240, 243, 245, 246, 250, 252
Offset: 1

Views

Author

Rémy Sigrist, Dec 05 2022

Keywords

Comments

This sequence lists the distinct values in A358893, in ascending order.
For any n > 0, there are A191755(n)/2 terms with binary length 2*n.
All terms are evil (A001969) and have an even number of binary digits (A053754).

Examples

			The binary expansion of 204 is "11001100" and can be obtained by self-shuffling the binary expansion of 10 ("1010") or 12 ("1100"), so 204 is a term.
		

Crossrefs

Programs

  • PARI
    See Links section.
Showing 1-2 of 2 results.