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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Hofstadter-Q-sequence/PARI-GP/hofstadter-q-sequence.parigp Normal file
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Q=vector(1000);Q[1]=Q[2]=1;for(n=3,#Q,Q[n]=Q[n-Q[n-1]]+Q[n-Q[n-2]]);
Q1=vecextract(Q,"1..10");
print("First 10 terms: "Q1,if(Q1==[1, 1, 2, 3, 3, 4, 5, 5, 6, 6]," (as expected)"," (in error)"));
print("1000-th term: "Q[1000],if(Q[1000]==502," (as expected)"," (in error)"));