OFFSET
1,2
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
MATHEMATICA
a3309[nmax_] := a3309[nmax] = Module[{t = Range[2, nmax], k, r = {1}}, While[Length[t] > 0, k = First[t]; AppendTo[r, k]; t = Drop[t, {1, -1, k}]]; r];
ludicQ[n_, nmax_] /; 1 <= n <= nmax := MemberQ[a3309[nmax], n];
nmax = 100;
b[n_] := Boole[ludicQ[n, nmax]];
Array[b, nmax] // Accumulate (* Jean-François Alcover, Dec 09 2021, after Ray Chandler in A003309 *)
PROG
(Haskell)
a192512 n = a192512_list !! (n-1)
a192512_list = scanl1 (+) $ map a192490 [1..]
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jul 05 2011
STATUS
approved