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A096274 Indices of zeros in A096535. 4

%I #20 Mar 20 2015 18:37:08

%S 2,8,13,20,25,595,1044,7932,74247,14693476,16766626,24072338,72643740,

%T 1881945888,3304284638,5163731431,5669949197,16209038688,23714508403,

%U 56796564073,181057353263,323874989643,406930606305,539293061152,1751203649485,2136659012156

%N Indices of zeros in A096535.

%C Suggested by _Leroy Quet_.

%t a = b = 1; lst = {}; Do[c = Mod[a + b, n]; If[c == 0, AppendTo[lst, n]; Print@n]; a = b; b = c, {n, 2, 10^9}] (* _Robert G. Wilson v_, Dec 17 2007 *)

%o #include <stdio.h> [C program from Peter Pein]

%o main(int argc, char *argv[])

%o { long long a0=1, a1=1, n=1, tmp, nmax;

%o if (argc != 2) { fprintf(stderr,"%s n\ncalculates the indices of the first n zeros in A096535\n", argv[0]);

%o return(1); }

%o nmax=atol(argv[1]);

%o while (nmax-- > 0) {

%o while(a1 != 0) {

%o tmp = (a0 + a1) % ++n; a0 = a1; a1 = tmp; }

%o printf("%lld\n",n++); a1 = a0; a0 = 0; }

%o return 0; }

%o (Haskell)

%o import Data.List (elemIndices)

%o a096274 n = a096274_list !! (n-1)

%o a096274_list = elemIndices 0 a096535_list

%o -- _Reinhard Zumkeller_, Oct 19 2011

%Y Cf. A096535: a(0) = a(1) = 1; a(n) = (a(n-1) + a(n-2)) mod n.

%Y Cf. A132678.

%K nonn

%O 1,1

%A _Jim Nastos_, Jun 24 2004

%E a(13) from _Robert G. Wilson v_, Jun 23 2004

%E a(14) - a(16) from _Robert G. Wilson v_, Aug 30 2006

%E Extended to a(26) by _Zak Seidov_, Peter Pein (petsie(AT)dordos.net) and _Martin Fuller_, Nov 22 2007

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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)