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A098953
Slowest increasing sequence where each number is such that at least one pair of adjacent digits are consecutive, the first of the pair being the smaller.
1
12, 23, 34, 45, 56, 67, 78, 89, 101, 112, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 134, 145, 156, 167, 178, 189, 201, 212, 223, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 245, 256, 267, 278, 289, 301, 312, 323, 334, 340, 341, 342, 343, 344, 345
OFFSET
1,1
COMMENTS
Corrected by Zak Seidov, Apr 15 2007
LINKS
PROG
(Python)
from itertools import count, islice
def cond(n):
d = list(map(int, str(n)))
return any(d[i+1] == d[i]+1 for i in range(len(d)-1))
def agen():
yield from filter(cond, count(1))
print(list(islice(agen(), 54))) # Michael S. Branicky, Dec 23 2021
CROSSREFS
A similar sequence: A082927
Sequence in context: A136414 A017401 A004960 * A228157 A363820 A072485
KEYWORD
base,easy,nonn
AUTHOR
Eric Angelini, Oct 21 2004
EXTENSIONS
a(51) and beyond from Michael S. Branicky, Dec 23 2021
STATUS
approved