A139121 -id:A139121 - cp's OEIS frontend

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

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

Olivier Gérard

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)!

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

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.)

N. Graner, Liponombres [<>]

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

is_A014254(n)=!setsearch(Set(Vec(French(n))),"e") \\ See A167507 for French(). - M. F. Hasler, Nov 11 2015

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

A139097 Form a sequence of words as follows: look to the left, towards the beginning of the sequence and write down the number of letters you see; repeat; then replace the words with the corresponding numbers.

Original entry on oeis.org

0, 4, 8, 13, 21, 30, 36, 45, 54, 63, 73, 85, 95, 105, 119, 137, 158, 178, 200, 211, 227, 248, 268, 288, 309, 325, 347, 369, 390, 408, 424, 445, 465, 485, 506, 520, 537, 559, 579, 601, 614, 632, 651, 669, 688, 709, 725, 747, 769, 790, 808, 825, 847, 869, 890, 908, 924, 945, 965, 985, 1006, 1020, 1037, 1059

Offset: 0

Jonathan Vos Post, May 12 2007

The sequence of words is: zero, four, eight, thirteen, twenty-one, thirty, ... (in American English).
Hyphens and spaces are not counted.
This is an English version of the sequence in A139121.
a(0) = 0, a(n+1) = a(n) + A005589(a(n)). - Jonathan Vos Post, Jun 15 2008

			The second word is "four" (and so a(2)=4), because at the end of the first word we can see four letters to the left.

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

M. F. Hasler, Table of n, a(n) for n = 0..423

Cf. A005589. See A060403 and A139121 for other versions.

Edited by N. J. A. Sloane, Jun 08 2008

More terms from M. F. Hasler and R. J. Mathar, Jun 15 2008

cp's OEIS Frontend

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

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