Search: id:A062291
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%I A062291
%S A062291 3,19,37,43,61,113,251,317,359,409,463,491,557,601,683,827,863,941,
%T A062291 1061,1097,1109,1213,1283,1291,1399,1423,1481,1583,1657,1693,1699,1811,
%U A062291 2069,2267,2297,2531,2687,2741,2851,3011,3181,3271,3323,3331,3347,3373
%N A062291 Primes p = p(k) such that k * p - 1 is also a prime.
%H A062291 Harry J. Smith, <a href="b062291.txt">Table of n, a(n) for n=1,...,1000</
               a>
%e A062291 19 is the 8th prime and 8*19-1 = 151 is a prime.
%t A062291 Select[ Prime[ Range[ 500 ] ], PrimeQ[ # PrimePi[ # ]-1 ]& ]
%o A062291 (PARI) for(n=1,200, if(isprime(n*prime(n)-1),print(prime(n))))
%o A062291 (PARI) { n=k=0; forprime (p=2, 5*10^5, k++; if (isprime(k*p - 1), write("b062291.txt", 
               n++, " ", p); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), 
               Aug 04 2009]
%Y A062291 Sequence in context: A061427 A069516 A098856 this_sequence A106082 A088786 
               A147237
%Y A062291 Adjacent sequences: A062288 A062289 A062290 this_sequence A062292 A062293 
               A062294
%K A062291 easy,nonn
%O A062291 1,1
%A A062291 Jason Earls (zevi_35711(AT)yahoo.com), Jul 02 2001
%E A062291 More terms from Harvey P. Dale (hpd1(AT)nyu.edu), Jul 05 2001

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