A349887 Numbers which, when written in English, contain exactly one instance of the letter E.

0, 1, 5, 8, 9, 10, 20, 22, 24, 26, 31, 35, 38, 39, 41, 45, 48, 49, 51, 55, 58, 59, 61, 65, 68, 69, 80, 82, 84, 86, 90, 92, 94, 96, 200, 202, 204, 206, 230, 232, 234, 236, 240, 242, 244, 246, 250, 252, 254, 256, 260, 262, 264, 266, 400, 402, 404, 406, 430, 432, 434, 436

Offset

1,3

Links

Table of n, a(n) for n=1..62.

Example

ZERO has one E, ONE also, but not TWO (no E) nor THREE (2 Es).

Prog

(Python)
from num2words import num2words
def ok(n): return num2words(n).count("e") == 1
print([k for k in range(667) if ok(k)]) # Michael S. Branicky, Dec 04 2021

Crossrefs

Cf. A006933 ('Eban' numbers).

Sequence in context: A337215 A314571 A191977 * A356252 A332245 A101079

Adjacent sequences: A349884 A349885 A349886 * A349888 A349889 A349890

Keyword

word,nonn

Author

Eric Angelini, Dec 04 2021

Status

approved