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 A255732 Rhonda numbers in vigesimal number system. 15
 1815, 11050, 15295, 21165, 22165, 30702, 34510, 34645, 42292, 44165, 52059, 53416, 65945, 78430, 80712, 84251, 84835, 86591, 112608, 146055, 148144, 156284, 175419, 178350, 194590, 200655, 201825, 202664, 204085, 209095, 209550, 211250, 212346, 212850 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A099542 for definition of Rhonda numbers and for more links. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 Eric Weisstein's World of Mathematics, Rhonda Number Wikipedia, Vigesimal EXAMPLE a(1) = 1815 = 4*20^2 + 10*20^1 + 15*20^0 = 3*5*11*11, with 4 * 10 * 15 = 20 * (3+5+11+11) = 600; a(10) = 44165 = 5*20^3 + 10*20^2 + 8*20^1 + 5*20^0 = 5*11*11*73, with 5 * 10 * 8 * 5 = 20 * (5+11+11+73) = 2000. PROG (Haskell) a255732 n = a255732_list !! (n-1) a255732_list = filter (rhonda 20) \$ iterate z 1 where z x = 1 + if r < 29 then x else 30 * z x' where (x', r) = divMod x 30 -- Function rhonda as in A099542. CROSSREFS Cf. Rhonda numbers to other bases: A100968 (base 4), A100969 (base 6), A100970 (base 8), A100973 (base 9), A099542 (base 10), A100971 (base 12), A100972 (base 14), A100974 (base 15), A100975 (base 16), A255735 (base 18), A255736 (base 30), A255731 (base 60), see also A255872. Cf. A001414, A027746. Column k=11 of A291925. Sequence in context: A238141 A058954 A205258 * A338166 A353807 A326236 Adjacent sequences: A255729 A255730 A255731 * A255733 A255734 A255735 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Mar 05 2015 STATUS approved

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Last modified April 21 13:26 EDT 2024. Contains 371870 sequences. (Running on oeis4.)