A182561 Position of first occurrence of n in A182535.
1, 4, 7, 16, 45, 74, 166, 529, 866, 1993, 4560, 9907, 27425, 62894, 161134, 386007, 1308165, 2363223, 7190239, 17844411, 54259731, 90564740, 308061971, 487568736, 1422102892, 3573737940, 8516241133, 22686128280, 77770540116, 144783290133, 365331892456, 928427248701, 2354811032695
Offset: 1
Keywords
Examples
First occurrence of 4 in A182535 has index 16, so a(4)=16.
Programs
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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 */
Extensions
Corrected and extended by Max Alekseyev, Jan 31 2014