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A182561 Position of first occurrence of n in A182535. 1

%I #18 Jan 31 2014 09:47:12

%S 1,4,7,16,45,74,166,529,866,1993,4560,9907,27425,62894,161134,386007,

%T 1308165,2363223,7190239,17844411,54259731,90564740,308061971,

%U 487568736,1422102892,3573737940,8516241133,22686128280,77770540116,144783290133,365331892456,928427248701,2354811032695

%N Position of first occurrence of n in A182535.

%e First occurrence of 4 in A182535 has index 16, so a(4)=16.

%o (PARI) { a(n) = my(k,p,t); k=n-1; while(1, k++; p=[]; forvec(v=vector(n-1,i,[1,k-1]), t = fibonacci(n+k) + sum(i=1,n-1,fibonacci(v[i]+i)); if(ispseudoprime(t),p=concat(p,[t])); ,2); if(p,return(primepi(vecmin(p)))); ); } /* _Max Alekseyev_, Jan 31 2014 */

%K nonn

%O 1,2

%A _Alex Ratushnyak_, May 05 2012

%E Corrected and extended by _Max Alekseyev_, Jan 31 2014

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)