|
%I #15 Sep 08 2022 08:46:05
%S 2,3,17,23,37,41,47,61,71,83,89,97,101,103,131,139,167,173,181,193,
%T 197,199,227,233,239,241,251,257,271,277,281,283,293,313,317,331,337,
%U 347,367,373,389,397,421,431,439,457,463,487,491,499,503,509,547,563,587,593
%N Smallest of five consecutive primes whose sum is not a prime.
%H Vincenzo Librandi, <a href="/A228198/b228198.txt">Table of n, a(n) for n = 1..1000</a>
%e 47 is in the sequence because 47+53+59+61+67 = 287 and 287 is not a prime.
%t Transpose[Select[Partition[Prime[Range[150]], 5, 1], ! PrimeQ[Total[#]] &]][[1]]
%t Prime[Select[Range[150], ! PrimeQ[Sum[Prime[# + i], {i, 0, 4}]] &]] (* _Bruno Berselli_, Aug 21 2013 *)
%o (Magma) [NthPrime(n): n in [1..120] | not IsPrime(&+[NthPrime(n+s): s in [0..4]])];
%Y Cf. A000040, A152468.
%K nonn
%O 1,1
%A _Vincenzo Librandi_, Aug 20 2013
|
