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 A035333 Concatenation of two or more consecutive positive integers. 10
 12, 23, 34, 45, 56, 67, 78, 89, 123, 234, 345, 456, 567, 678, 789, 910, 1011, 1112, 1213, 1234, 1314, 1415, 1516, 1617, 1718, 1819, 1920, 2021, 2122, 2223, 2324, 2345, 2425, 2526, 2627, 2728, 2829, 2930, 3031, 3132, 3233, 3334, 3435, 3456, 3536, 3637, 3738 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Paul Tek, Table of n, a(n) for n = 1..10000 PROG (Python) import heapq from itertools import islice def agen(): c = 12 h = [(c, 1, 2)] nextcount = 3 while True: (v, s, l) = heapq.heappop(h) yield v if v >= c: c = int(str(c) + str(nextcount)) heapq.heappush(h, (c, 1, nextcount)) nextcount += 1 l += 1; v = int(str(v)[len(str(s)):] + str(l)); s += 1 heapq.heappush(h, (v, s, l)) print(list(islice(agen(), 47))) # Michael S. Branicky, Dec 23 2021 CROSSREFS For concatenations of exactly k consecutive integers see A000027 (k=1), A127421 (k=2), A001703 (k=3), A279204 (k=4). See also A007908 for concatenation of 1 through n. For primes see A052087. All of A007908, A052087, A053067, A279610 are subsequences. Sequence in context: A228157 A363820 A072485 * A001704 A127421 A112131 Adjacent sequences: A035330 A035331 A035332 * A035334 A035335 A035336 KEYWORD easy,nonn,base AUTHOR Erich Friedman EXTENSIONS Edited by Charles R Greathouse IV, Apr 28 2010 Corrected by Paul Tek, Jun 08 2013 STATUS approved

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Last modified June 25 18:50 EDT 2024. Contains 373707 sequences. (Running on oeis4.)