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 A045800 0-ish numbers (end in 01, 07, 43, 49). 10
 1, 7, 43, 49, 101, 107, 143, 149, 201, 207, 243, 249, 301, 307, 343, 349, 401, 407, 443, 449, 501, 507, 543, 549, 601, 607, 643, 649, 701, 707, 743, 749, 801, 807, 843, 849, 901, 907, 943, 949, 1001, 1007, 1043, 1049, 1101, 1107, 1143, 1149, 1201, 1207 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 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*(1+6*x+36*x^2+6*x^3+51*x^4)/(1-x-x^4+x^5). - Colin Barker, Jan 23 2012 a(n) = (50*n-8*i^(n*(n+1))-19*(-1)^n-75)/2, where i=sqrt(-1). - Bruno Berselli, Feb 22 2012 MATHEMATICA LinearRecurrence[{1, 0, 0, 1, -1}, {1, 7, 43, 49, 101}, 60] (* Harvey P. Dale, Jul 26 2015 *) PROG (Haskell) import Data.List (findIndices) a045800 n = a045800_list !! (n-1) a045800_list = findIndices (`elem` [1, 7, 43, 49]) \$ cycle [0..99] -- Reinhard Zumkeller, Jan 23 2012 CROSSREFS Cf. A045801-A045809, A045572, A045797, A045798. Sequence in context: A043064 A175159 A173828 * A159254 A062336 A085704 Adjacent sequences:  A045797 A045798 A045799 * A045801 A045802 A045803 KEYWORD nonn,base,easy AUTHOR EXTENSIONS More terms from Erich Friedman. STATUS approved

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Last modified March 22 10:07 EDT 2019. Contains 321421 sequences. (Running on oeis4.)