Search: id:A119488
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%I A119488
%S A119488 13,23,41,83,103,89,103,113,227,229,547,373,419,263,373,787,419,433,593,
%T A119488 563,577,739,487,811,823,683,1013,599,1153,641,827,1571,1223,863,883,
%U A119488 719,1567,1187,1279,1999,1361,1373,1951,1297,2477,1091,1399,1117,2897
%N A119488 Primes of the form (i+1.th prime)*(i+1) - (i.th prime)*i.
%e A119488 The fourth prime is 7 and the third is 5.
%e A119488 Therefore 7*4 - 5*3 = 28 - 15 = 13 that is a prime.
%p A119488 P:=proc(n) local i,j; for i from 1 by 1 to n do j:=ithprime(i+1)*(i+1)-ithprime(i)*i; 
               if isprime(j) then print(i); fi; od; end: P(200);
%Y A119488 Cf. A119487.
%Y A119488 Sequence in context: A164494 A164407 A135283 this_sequence A165350 A112394 
               A067227
%Y A119488 Adjacent sequences: A119485 A119486 A119487 this_sequence A119489 A119490 
               A119491
%K A119488 easy,nonn
%O A119488 1,1
%A A119488 Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), May 23 2006

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