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 A282622 Number of digits of the representation of n in the alternating sexagesimal-decimal number system. 3
 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,10 COMMENTS For a(1)..a(59) this sequence coincides with A055642. For the alternating sexagesimal-decimal number system see a comment in A055643. LINKS FORMULA a(n) = 1 for n = 1..9, a(n) = 2 for n = 10..59, a(n) = 3 for n = 60..599, a(n) = 4 for n = 600..3600, ..., i.e., a(n) = k, k >= 1, for n = A281863(k-1)..A281863(k)-1. MATHEMATICA With[{nn = 120}, IntegerLength[Range@ 120, MixedRadix[Flatten@ ConstantArray[{6, 10}, {2 Ceiling@ Log[60, nn]}]]]] (* Version 10.2, or *) Table[StringLength@ If[StringTake[#, 1] == "0", StringDrop[#, 1], #] &@ StringJoin@ Map[If[# < 10, StringJoin["0", ToString@ #], ToString@ #] &, IntegerDigits[n, 60]], {n, 120}] (* Michael De Vlieger, Feb 20 2017 *) CROSSREFS Cf. A055642, A281863, A055643. Sequence in context: A211670 A036452 A285481 * A102572 A098391 A071702 Adjacent sequences:  A282619 A282620 A282621 * A282623 A282624 A282625 KEYWORD nonn,easy AUTHOR Wolfdieter Lang, Feb 20 2017 STATUS approved

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Last modified January 25 16:42 EST 2020. Contains 331245 sequences. (Running on oeis4.)