A019270 A self-descriptive sequence: positions of vowels in "one, three, seven,...".

1, 3, 7, 8, 10, 12, 14, 15, 20, 24, 27, 29, 30, 33, 34, 37, 40, 41, 45, 51, 56, 57, 61, 66, 68, 72, 77, 79, 82, 88, 95, 96, 99, 104, 105, 109, 114, 116, 119, 124, 128, 130, 132, 137, 139, 141, 145, 147, 149, 154, 157, 162, 164, 167, 171, 173, 175, 180

Offset

1,2

Comments

The following sequence of words has the property that it tells which letters in the sequence are vowels: one, three, seven, eight, ten, twelve, ... Now replace the words by their numerical values.

If there is a choice, pick the smallest number (or word) that makes sense. Hyphens and spaces are ignored.

References

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

Links

Table of n, a(n) for n=1..58.

Example

The first vowel is the "o" in "one", in position 1, the second vowel is the "e" in "one", the third letter in the sentence (i.e. in position 3) and so on.

Crossrefs

See A139133 for a version involving consonants.

See A139132 for a French version.

Sequence in context: A030684 A276002 A089970 * A047357 A003607 A087859

Adjacent sequences: A019267 A019268 A019269 * A019271 A019272 A019273

Keyword

word,nonn

Author

Scott Sauyet (ssauyet(AT)claude.math.wesleyan.edu)

Status

approved