OFFSET

1,1

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

PROG

(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

CROSSREFS

KEYWORD

AUTHOR

N. J. A. Sloane, Dec 11 2023

STATUS

approved