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 A216261 Smallest positive number using exactly n segments on a calculator display (when '6' and '7' are represented using 6 resp. 3 segments). 7
 1, 7, 4, 2, 0, 8, 10, 18, 22, 20, 28, 68, 88, 108, 188, 200, 208, 288, 688, 888, 1088, 1888, 2008, 2088, 2888, 6888, 8888, 10888, 18888, 20088, 20888, 28888, 68888, 88888, 108888, 188888, 200888, 208888, 288888, 688888, 888888, 1088888, 1888888, 2008888, 2088888, 2888888 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 COMMENTS Essentially the same as A038619 and A143617. One could argue that a(3) should rather be -1 (prior to adding "positive" in the definition), which does use 3 segments on typical 7-segment displays, and is smaller than 7. Also, most pocket calculators and the Unicode standard (cf. links) use 4 rather than 3 segments to represent a '7' (as in A074458 and A010371, rather than A063720, A277116 or A006942), in which case a(3) is undefined if negative numbers are not allowed. No digit '9' will ever occur here, whether it would be represented with 6 or only 5 segments. However, digit '6' does occur, as the second smallest digit using 6 segments as does '0', which cannot occur as leading digit. If '6' is represented with 5 segments, any prefix 68 would be replaced with 80. - M. F. Hasler and Kevin Ryde, Jun 17 2020 LINKS Unicode, Symbols for Legacy Computing, The Unicode Standard, Version 13.0, 2020. Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,10,-10). FORMULA A006942(a(n)) = n and A006942(m) <> n for m < a(n). a(n+7) = 10*a(n) + 8 for n > 10. This can be deduced from a(n) = min{10*a(n-A006942(r))+r, r=0..9} via strong induction. - David Radcliffe, Jan 29 2016 G.f.: (x^2 +6*x^3 -3*x^4 -2*x^5 -2*x^6 +8*x^7 +2*x^8 -2*x^9 -56*x^10 +28*x^11 +28*x^12 +60*x^13 -60*x^14 -28*x^17 +28*x^18)/((1-x)*(1-10*x^7)). - David Radcliffe, Jan 29 2016 MATHEMATICA Drop[#, 2] &@ CoefficientList[Series[(x^2 + 6 x^3 - 3 x^4 - 2 x^5 - 2 x^6 + 8 x^7 + 2 x^8 - 2 x^9 - 56 x^10 + 28 x^11 + 28 x^12 + 60 x^13 - 60 x^14 - 28 x^17 + 28 x^18)/((1 - x) (1 - 10 x^7)), {x, 0, 50}], x] (* Michael De Vlieger, Jan 29 2016 *) PROG (Haskell) import Data.Maybe (fromJust) import Data.List (elemIndex) a216261 = fromJust . (`elemIndex` a006942_list) -- Reinhard Zumkeller, Mar 15 2013 (PARI) Vec((x^2 +6*x^3 -3*x^4 -2*x^5 -2*x^6 +8*x^7 +2*x^8 -2*x^9 -56*x^10 +28*x^11 +28*x^12 +60*x^13 -60*x^14 -28*x^17 +28*x^18)/((1-x)*(1-10*x^7)) + O(x^50)) \\ Michel Marcus, Jan 29 2016 CROSSREFS Cf. A006942, A010371, A063720, A074458, A277116; A234691, A234692. Cf. A038619 and A143617 (identical up to initial terms). Sequence in context: A187056 A103240 A155531 * A188628 A021578 A273093 Adjacent sequences:  A216258 A216259 A216260 * A216262 A216263 A216264 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Mar 15 2013 EXTENSIONS Name and cross-references edited by M. F. Hasler, Jun 17 2020 STATUS approved

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Last modified January 26 08:50 EST 2021. Contains 340435 sequences. (Running on oeis4.)