A268544 Numbers whose name in American English has exactly four e's.

17, 73, 77, 103, 107, 112, 113, 114, 115, 116, 121, 125, 128, 129, 133, 137, 143, 147, 153, 157, 163, 167, 170, 172, 174, 176, 181, 185, 188, 189, 191, 195, 198, 199, 211, 218, 219, 223, 227, 271, 275, 278, 279, 283, 287, 293, 297, 301, 305, 308, 309, 310, 320

Offset: 1

Author

N. J. A. Sloane, Feb 07 2016

Keywords

• nonn
• word

Comments

Arose in discussion of A268236.

Examples

			17 is a term because seventeen has four e's.
		

Links

• Michael S. Branicky, Table of n, a(n) for n = 1..10000
• Robert G. Wilson v, American English names for the numbers from 0 to 100999 without spaces or hyphens

Crossrefs

Cf. A001477, A268236.

Programs

Python

from num2words import num2words
def ok(n): return num2words(n).count('e') == 4
print([k for k in range(321) if ok(k)]) # Michael S. Branicky, Mar 25 2025

Extensions

a(35) and beyond from Michael S. Branicky, Mar 25 2025