A123267 T is the first, sixth, fourteenth, etc. character in this sentence. (In this version, letters, spaces, commas and hyphens all count.)

1, 6, 14, 20, 28, 32, 36, 40, 43, 47, 51, 58, 62, 66, 77, 81, 87, 94, 97, 104, 107, 117, 125, 132, 139, 145, 152, 159, 173, 179, 188, 196, 204, 211, 218, 226, 234, 241, 249, 257, 277, 298, 319, 323, 339, 343, 349, 365, 369, 392, 396, 402, 421, 427, 446, 472

Offset: 1

Author

J. Lowell, Oct 09 2006

Keywords

• nonn
• word

Examples

			  0123456789
0  T is the
1 first, six
2 th, fourte
3 enth, twen
4 tieth, twe
5 nty-eighth
6 , thirty-s
7 econd, thi
8 rty-sixth,
9  fortieth,
0  forty-thi
1 rd, forty-
		

Links

• Michael S. Branicky, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A005224.

Programs

Python

from num2words import num2words
from itertools import islice
def n2w(n): return num2words(n, ordinal=True).replace(" and", "")
def agen(): # generator of terms
    s, idx = "t is the ", 0
    while True:
        idx = 1 + s.index("t", idx)
        yield idx
        s += n2w(idx) + ", "
print(list(islice(agen(), 56))) # Michael S. Branicky, Mar 18 2022

Extensions

a(7)-a(22) from R. J. Mathar, Nov 10 2006

a(23) and beyond from Michael S. Branicky, Mar 18 2022