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.

A119246 Numbers containing in decimal representation their digital root.

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20, 29, 30, 39, 40, 49, 50, 59, 60, 69, 70, 79, 80, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 109, 118, 127, 128, 136, 138, 145, 148, 154, 158, 163, 168, 172, 178, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 198, 199, 200
Offset: 1

Views

Author

Reinhard Zumkeller, May 10 2006

Keywords

Comments

Complement of A119247.
For terms u: all digital permutations of u form terms; u*10 and all insertions of 0 are terms; if v is another term, then the concatenations uv, vu are also terms, as well as all insertions of v in u; these properties allow the construction of all terms beginning with {d:1<=d<=9}. - Reinhard Zumkeller, May 19 2006

Links

Crossrefs

Cf. A010888.
Cf. A052018, A031298, A138166.

Programs

  • Haskell
    a119246 n = a119246_list !! (n-1)
a119246_list =
    filter (\x -> a010888 x `elem` a031298_row (fromInteger x)) [0..]
-- Reinhard Zumkeller, Dec 16 2013, Apr 14 2011
  • Mathematica
    d[n_] := IntegerDigits[n]; Select[Range[0, 200], MemberQ[d[#1], NestWhile[Total[d[#]] &, #1, # > 9 &]] &] (* Jayanta Basu, Jul 13 2013 *)

A384919 Tooth numbering sytem (permanent), FDI and ISO 3950.

Original entry on oeis.org

18, 17, 16, 15, 14, 13, 12, 11, 21, 22, 23, 24, 25, 26, 27, 28, 48, 47, 46, 45, 44, 43, 42, 41, 31, 32, 33, 34, 35, 36, 37, 38
Offset: 1

Views

Author

Wolfdieter Lang, Jun 12 2025

Keywords

Comments

Only two rows, each of length 16.
This array gives the permanent tooth numbering systems for humans, according to the FDI two-digit notation, and IS0 3950.
For the deciduous (baby, milk) tooth numbering system for humans see A384920.

Examples

			Row 1: patient's upper right, patient's upper left:
18 17 16 15 14 13 12 11, 21 22 23 24 25 26 27 28
Row 2: patient's lower right, patient's lower left:
48 47 46 45 44 43 42 41, 31 32 33 34 35 36 37 38

Links

Crossrefs

Cf. A119247, A384920.

A384920 Tooth numbering sytem (deciduous), FDI and ISO 3950.

Original entry on oeis.org

55, 54, 53, 52, 51, 61, 62, 63, 64, 65, 85, 84, 83, 82, 81, 71, 72, 73, 74, 75
Offset: 1

Views

Author

Wolfdieter Lang, Jun 12 2025

Keywords

Comments

Only two rows, each of length 10.
This array gives the deciduous (baby, milk) tooth numbering systems for humans, according to the FDI two-digit notation, and IS0 3950.
For the permanent teeth numbering for humans see A384919.

Examples

			Human deciduous teeth.
Row 1: baby's upper right, baby's upper left:
55 54 53 52 51, 61 62 63 64 65
Row 2: baby's lower right, baby's lower left:
85 84 83 82 81, 71 72 73 74 75

Links

Crossrefs

Cf. A119247, A384919.
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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