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 A045801 1-ish numbers (end in 11, 39, 73, 77). 2
 11, 39, 73, 77, 111, 139, 173, 177, 211, 239, 273, 277, 311, 339, 373, 377, 411, 439, 473, 477, 511, 539, 573, 577, 611, 639, 673, 677, 711, 739, 773, 777, 811, 839, 873, 877, 911, 939, 973, 977, 1011, 1039, 1073, 1077, 1111, 1139, 1173, 1177, 1211, 1239 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (1,0,0,1,-1). FORMULA G.f.: x*(11+28*x+34*x^2+4*x^3+23*x^4)/(1-x-x^4+x^5). - Colin Barker, Jan 23 2012 a(n) = (50*n-12*i^(n*(n-1))-9*(-1)^n-25)/2, where i=sqrt(-1). - Bruno Berselli, Feb 23 2012 MATHEMATICA Table[100n+k, {n, 0, 20}, {k, {11, 39, 73, 77}}]//Flatten (* or *) LinearRecurrence[ {1, 0, 0, 1, -1}, {11, 39, 73, 77, 111}, 80] (* Harvey P. Dale, Jul 05 2019 *) PROG (Haskell) import Data.List (findIndices) a045801 n = a045801_list !! (n-1) a045801_list = findIndices (`elem` [11, 39, 73, 77]) \$ cycle [0..99] -- Reinhard Zumkeller, Jan 23 2012 CROSSREFS Cf. A045800-A045809, A045572, A045797, A045798. Sequence in context: A133258 A288745 A103738 * A162261 A004188 A163634 Adjacent sequences:  A045798 A045799 A045800 * A045802 A045803 A045804 KEYWORD nonn,base,easy AUTHOR EXTENSIONS More terms from Erich Friedman. STATUS approved

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Last modified October 16 13:30 EDT 2019. Contains 328092 sequences. (Running on oeis4.)