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 A173523 1+A053735(n-1), where A053735 is the sum-of-digits function in base 3. 7
 1, 2, 3, 2, 3, 4, 3, 4, 5, 2, 3, 4, 3, 4, 5, 4, 5, 6, 3, 4, 5, 4, 5, 6, 5, 6, 7, 2, 3, 4, 3, 4, 5, 4, 5, 6, 3, 4, 5, 4, 5, 6, 5, 6, 7, 4, 5, 6, 5, 6, 7, 6, 7, 8, 3, 4, 5, 4, 5, 6, 5, 6, 7, 4, 5, 6, 5, 6, 7, 6, 7, 8, 5, 6, 7, 6, 7, 8, 7, 8, 9, 2, 3, 4, 3, 4, 5, 4, 5, 6, 3, 4, 5, 4, 5, 6, 5, 6, 7, 4, 5, 6, 5, 6, 7, 6, 7, 8, 3, 4, 5, 4, 5, 6, 5, 6, 7, 4, 5, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A053735 can be obtained as 0 followed by the first 2 terms of this sequence, followed by the first 6 terms, followed by the first 18 terms, ..., followed by the first 2*3^n terms, etc. Similar observations are possible for: A063787 (base-2 case), and generic comments have been gathered in A173525 (base-5 case). Fixed point of morphism 1->123, 2->234, 3->345 etc. (start with 1). LINKS EXAMPLE If written as a triangle, begins: 1, 2,3, 2,3,4,3,4,5, 2,3,4,3,4,5,4,5,6,3,4,5,4,5,6,5,6,7, 2,3,4,3,4,5,4,5,6,3,4,5,4,5,6,5,6,7,4,5,6,5,6,7,6,7,8,... CROSSREFS Cf. A000120, A053735, A063787, A173524 - A173529. Sequence in context: A156723 A240834 A256993 * A199323 A156549 A275868 Adjacent sequences:  A173520 A173521 A173522 * A173524 A173525 A173526 KEYWORD base,nonn AUTHOR Omar E. Pol, Feb 20 2010 STATUS approved

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Last modified December 17 00:41 EST 2018. Contains 318191 sequences. (Running on oeis4.)