A072685 Positive integers whose English names contain a prime number of letters.

1, 2, 3, 6, 7, 8, 10, 15, 16, 23, 27, 28, 33, 37, 38, 40, 50, 60, 70, 74, 75, 79, 83, 87, 88, 93, 97, 98, 104, 105, 109, 111, 112, 120, 124, 125, 129, 130, 134, 135, 139, 143, 147, 148, 153, 157, 158, 163, 167, 168, 171, 172, 176, 180, 184, 185, 189, 190, 194, 195

Offset

1,2

Links

Table of n, a(n) for n=1..60.

Example

First value is 1 because 1 -> "ONE" -> 3 letters and 3 is prime. Numbers >100 use naming convention using "and": 199 -> "ONEHUNDREDANDNINETYNINE" -> 23 letters and 23 is prime.

Crossrefs

Sequence in context: A179794 A221977 A001162 * A119960 A273265 A015841

Adjacent sequences: A072682 A072683 A072684 * A072686 A072687 A072688

Keyword

easy,nonn,word

Author

Mark Hudson (mrmarkhudson(AT)hotmail.com), Jul 02 2002

Status

approved