A367610 Comma transform of A367362.

11, 22, 33, 44, 55, 66, 77, 88, 99, 11, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 21, 22, 23, 24, 25, 26, 27, 28, 29, 33, 31, 32, 33, 34, 35, 36, 37, 38, 39, 44, 41, 42, 43, 44, 45, 46, 47, 48, 49, 55, 51, 52, 53, 54, 55, 56, 57, 58, 59, 66, 61, 62, 63, 64, 65, 66, 67, 68, 69, 77, 71, 72, 73, 74, 75, 76, 77, 78, 79

Offset: 1

Author

N. J. A. Sloane, Dec 11 2023

Keywords

• nonn
• base
• look

Comments

This is the second-order comma transform of the nonnegative integers.

See A367360 for further information.

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..9999

Crossrefs

Cf. A367360, A367362.

Programs

Python

from itertools import count, islice, pairwise
def S(): yield from (str(i) for i in count(0))
def C(): yield from (str(int(t[-1]+u[0])) for t, u in pairwise(S()))
def a(): yield from (int(t[-1]+u[0]) for t, u in pairwise(C()))
print(list(islice(a(), 80))) # Michael S. Branicky, Dec 11 2023