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Search: id:A088198
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| 1, 2, 1, 1, 2, 3, 1, 1, 2, 1, 2, 3, 1, 1, 2, 1, 2, 1, 1, 5, 1, 1, 3, 5, 2, 1, 1, 2, 3, 1, 1, 3, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 5, 2, 1, 1, 1, 1, 2, 3, 1, 7, 1, 3, 1, 2, 1, 2, 3, 1, 2, 1, 1, 5, 2, 1, 5, 1, 2, 3, 1, 1, 2, 1, 1, 2, 2, 3, 7, 1, 2, 1, 5, 1, 1, 3, 5, 2, 1, 1, 1, 1, 1, 1, 1, 2, 3, 1, 2
(list; graph; listen)
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OFFSET
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2,2
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COMMENT
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The members of the sequence are either 1's or primes (easily provable)
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LINKS
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Ferenc Adorjan, The sequence of largest quadratic residues modulo the primes.
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FORMULA
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a(n)=p(n)-LQnR(p(n)), where p(n) is the n-th prime and LQnR(x) is the lagest quadratic non-residue modulo x.
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PROGRAM
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(PARI) qnrp_pm(fr, n)= {/* The the distance of primes from the largest QnR modulo the primes */ local(m, p, fl, jj, j, v=[]); fr=max(fr, 2); for(i=fr, n, m=0; p=prime(i); jj=0; fl=2^p-1; j=2; while((j<=(p-1)/2), jj=(j^2)%p; fl-=2^jj; j++); j=p-1; while(m==0, if(bitand(2^j, fl), m=j); j--); v=concat(v, p-m)); print(v)}
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CROSSREFS
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Cf. A088192, A088196, A088197, A088199, A088200, A088201.
Adjacent sequences: A088195 A088196 A088197 this_sequence A088199 A088200 A088201
Sequence in context: A116361 A106796 A082850 this_sequence A088426 A124769 A128227
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KEYWORD
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easy,nonn
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AUTHOR
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Ferenc Adorjan (fadorjan(AT)freemail.hu), Sep 23 2003
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