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 1-5 of 5 results.

A139358 A non-monotonic analog of A139212 in which the sequence describes the positions of the consonants when the sequence is written in French (version 3).

Original entry on oeis.org

12, 4, 6, 10, 14, 18, 1, 9, 15, 17, 21, 23, 24, 26, 28, 29, 32, 34, 35, 38, 39, 42, 43, 45, 47, 48, 50, 51, 52, 54, 55, 56, 58, 60, 61, 63, 64, 65, 66, 67, 70, 71, 73, 74, 75, 76, 79, 80, 82, 84, 85, 86, 87, 89, 90, 92, 93, 94, 95, 98, 99, 101, 102, 103, 104
Offset: 1

Views

Author

N. J. A. Sloane (based on Angelini's article), Jun 08 2008

Keywords

Comments

The sequence depends on how the initial terms are selected - see the Angelini article for the precise definition.
The initial terms are selected such that the sequence starts with 6 even numbers less than 20. - Tyler Busby, Jan 06 2023

Links

  • Eric Angelini, Jeux de suites, in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.

Crossrefs

Cf. A139212, A139356, A139357.

Programs

  • PARI
    lista(n) = frconspos([12, 4, 6, 10, 14, 18])(n)
/* see A139356 for frconspos() */
\\ Tyler Busby, Jan 06 2023

Extensions

More terms from Tyler Busby, Jan 06 2023

A139282 Form a sequence of words as follows: look to the left, towards the beginning of the sequence and write down the number of vowels you see; repeat; then replace the words with the corresponding numbers.

Original entry on oeis.org

0, 2, 3, 5, 7, 9, 11, 14, 18, 22, 24, 27, 30, 31, 34, 37, 40, 41, 44, 47, 50, 51, 54, 57, 60, 61, 64, 67, 70, 72, 75, 79, 83, 87, 91, 95, 99, 103, 110, 116, 124, 132, 139, 147, 155, 163, 171, 180, 187, 196, 204, 210, 215, 222, 228, 235, 242, 248, 255, 262, 268, 275
Offset: 0

Views

Author

N. J. A. Sloane, Jun 08 2008

Keywords

Comments

The sequence of words is: zero, two, three, five, seven, nine, eleven, fourteen, ...
Hyphens and spaces are not counted.

Examples

			The second word is "two" (and so a(2)=2), because at the end of the first word we can see two vowels (the vowels in "zero") to the left.

References

  • E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.

Crossrefs

For a French version see A139212.

Extensions

Cross reference corrected by Sean A. Irvine, Mar 15 2010
More terms from Sean A. Irvine, Mar 15 2010

A014254 Liponombres: numbers whose French name does not contain the letter "e".

Original entry on oeis.org

1, 3, 5, 6, 8, 10, 18, 20, 23, 25, 26, 28, 1000000, 1000001, 1000003, 1000005, 1000006, 1000008, 1000010, 1000018, 1000020, 1000023, 1000025, 1000026, 1000028, 3000000, 3000001, 3000003, 3000005, 3000006, 3000008, 3000010
Offset: 1

Views

Author

Olivier Gérard

Keywords

Comments

In French also called: les nombres "évites" ou "apparés".
Could also be called les nombres "epers". - Benoit Cloitre, May 05 2003
French version of eban numbers (A006933): no "e" in name of number in French - "e" perd ("e" lost)!

Examples

			a(1) = 1 ("un"), a(2) = 3 ("trois", not "dEux")

References

  • Georges Perec, La disparition, Editions Gallimard, Paris, 1969; English translation: A Void, Harvill, 1994. (A novel that does not use the letter "e". These numbers are not mentioned, however.)

Links

Crossrefs

Cf. A006933, A050280 (primes); A167507, A139212, A007005, A139121, A233185.

Programs

Extensions

Additional comments from Bruno Salvy (Bruno.Salvy(AT)inria.fr) and Nicolas Graner (Nicolas.Graner(AT)cri.u-psud.fr), May 11 2003
Corrected by Don Reble, Nov 19 2006
Edited by M. F. Hasler, Nov 11 2015

A139356 Sequence describing the positions of the consonants when the sequence is written in French (version 1).

Original entry on oeis.org

4, 1, 5, 8, 9, 11, 12, 13, 16, 17, 20, 22, 23, 25, 28, 30, 31, 34, 36, 39, 41, 43, 44, 46, 47, 48, 50, 51, 52, 53, 55, 56, 57, 58, 61, 62, 64, 65, 66, 67, 68, 71, 72, 74, 75, 76, 77, 79, 80, 81, 83, 84, 85, 86, 89, 90, 91, 93, 94, 96, 97, 99, 100, 103, 105
Offset: 1

Views

Author

N. J. A. Sloane (based on Angelini's article), Jun 08 2008

Keywords

Comments

The sequence depends on how the initial terms are selected - see the Angelini article for the precise definition.

Links

  • Eric Angelini, Jeux de suites, in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.

Crossrefs

Cf. A139212, A139357, A139358, A167507.

Programs

  • PARI
    lista(n) = frconspos([4])(n)
frconspos(startseq) = n -> {
my(consonants = Vec("bcdfghjklmnpqrstvwxyz"), charoffset = 0, seqindex = #startseq + 1, seq = Vec(startseq, n));
if(n <= #startseq, seq[1..n], for(i = 1, n, my(thisfrench = Vec(strchr([c|c<-Vecsmall(French(seq[i])), c>96])), consonantindexes = select(x->setsearch(consonants, x), thisfrench, 1));
for(j = 1, #consonantindexes, if(#select(I -> I == consonantindexes[j] + charoffset, startseq) == 0, if(seqindex + j - 1 <= n, seq[seqindex] = consonantindexes[j] + charoffset; seqindex++)));
charoffset += #thisfrench);
seq)}
/* see A167507 for French() */
\\ Tyler Busby, Dec 31 2022

Extensions

a(12) corrected and more terms from Tyler Busby, Dec 31 2022

A139357 Sequence describing the positions of the consonants when the sequence is written in French (version 2).

Original entry on oeis.org

20, 23, 1, 5, 3, 4, 6, 8, 9, 10, 11, 12, 15, 17, 18, 21, 22, 26, 27, 30, 31, 33, 35, 36, 39, 40, 43, 44, 46, 48, 49, 51, 54, 56, 59, 60, 62, 64, 65, 67, 68, 69, 71, 72, 75, 76, 78, 79, 80, 82, 84, 85, 87, 88, 89, 90, 93, 94, 96, 97, 98, 99, 101, 102, 104, 105
Offset: 1

Views

Author

N. J. A. Sloane (based on Angelini's article), Jun 08 2008

Keywords

Comments

The sequence depends on how the initial terms are selected - see the Angelini article for the precise definition.
The initial terms are selected such that the sequence starts with 6 even numbers less than 20. - Tyler Busby, Jan 01 2023

Links

  • Eric Angelini, Jeux de suites, in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.

Crossrefs

Cf. A139212, A139356, A139358.

Programs

  • PARI
    lista(n) = frconspos([20,23,1,5])(n)
/* see A139356 for frconspos() */
\\ Tyler Busby, Jan 01 2023

Extensions

More terms from Tyler Busby, Jan 01 2023
Showing 1-5 of 5 results.

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

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