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 A366487 First differences of "commas" sequence A121805. 6
 11, 23, 59, 41, 51, 62, 83, 13, 43, 74, 14, 55, 5, 55, 5, 56, 16, 77, 47, 18, 99, 89, 71, 81, 91, 1, 11, 21, 31, 41, 51, 61, 71, 81, 91, 1, 11, 21, 31, 41, 51, 61, 71, 82, 2, 22, 42, 62, 82, 2, 22, 42, 62, 82, 2, 22, 42, 62, 82, 2, 22, 42, 62, 82, 2, 22, 42, 63, 93, 23, 53, 83, 13, 43, 73, 3, 33, 63, 93, 23, 53, 83, 13, 43, 73, 3, 33, 63, 94, 34, 74, 14, 54, 94, 34, 74, 14, 54, 94 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The record high points in this sequence are 11, 23, 59, 62, 83, 99, and they occur at terms 1, 2, 3, 6, 7, 21. Since 99 is the largest possible term, this is the full list of record high points. The first differences of this sequence (i.e., the second differences of A121805) fall into the range [-90,90] for the first 99999 terms. More generally, for a commas sequence in base b, the first differences are <= b^2 - 1. - Michael S. Branicky, Nov 16 2023. LINKS Michael S. Branicky, Table of n, a(n) for n = 1..20000 (terms 1..1000 from N. J. A. Sloane) Eric Angelini, Michael S. Branicky, Giovanni Resta, N. J. A. Sloane, and David W. Wilson, The Comma Sequence: A Simple Sequence With Bizarre Properties, arXiv:2401.14346, Youtube Michael S. Branicky, Table of n, a(n) for n = 1..100000 Michael S. Branicky, Graph of entire sequence PROG (Python) from itertools import islice def agen(): # generator of terms an, y = 1, 1 while y < 10: prevan = an an, y = an + 10*(an%10), 1 while y < 10: if str(an+y)[0] == str(y): an += y break y += 1 yield an - prevan print(list(islice(agen(), 99))) # Michael S. Branicky, Nov 12 2023 CROSSREFS Cf. A121805. For the numbers missing from this sequence see A367349. Sequence in context: A098100 A105967 A097473 * A081510 A068844 A139905 Adjacent sequences: A366484 A366485 A366486 * A366488 A366489 A366490 KEYWORD nonn,fini,base AUTHOR N. J. A. Sloane, Nov 12 2023 STATUS approved

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Last modified May 24 13:22 EDT 2024. Contains 372773 sequences. (Running on oeis4.)