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A045804 4-ish numbers (end in 09, 41, 63, 87). 1

%I

%S 9,41,63,87,109,141,163,187,209,241,263,287,309,341,363,387,409,441,

%T 463,487,509,541,563,587,609,641,663,687,709,741,763,787,809,841,863,

%U 887,909,941,963,987,1009,1041,1063,1087,1109,1141,1163,1187,1209,1241

%N 4-ish numbers (end in 09, 41, 63, 87).

%H Reinhard Zumkeller, <a href="/A045804/b045804.txt">Table of n, a(n) for n = 1..1000</a>

%F Empirical G.f.: x*(9+32*x+22*x^2+24*x^3+13*x^4)/(1-x-x^4+x^5). [Colin Barker, Jan 23 2012]

%o (Haskell)

%o import Data.List (findIndices)

%o a045804 n = a045804_list !! (n-1)

%o a045804_list = findIndices (`elem` [9,41,63,87]) $ cycle [0..99]

%o -- _Reinhard Zumkeller_, Jan 23 2012

%Y Cf. A045800-A045809.

%Y Cf. A045572, A045797, A045798.

%K nonn,base,easy

%O 1,1

%A _J. H. Conway_.

%E More terms from _Erich Friedman_.

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Last modified April 18 10:35 EDT 2019. Contains 322209 sequences. (Running on oeis4.)