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A118571 Sophie Germain primes whose sum of digits is a prime. 2

%I #9 Feb 08 2021 05:27:01

%S 2,3,5,11,23,29,41,83,89,113,131,173,179,191,281,359,443,593,641,683,

%T 719,809,911,953,1013,1019,1031,1103,1439,1451,1499,1583,1811,1901,

%U 2003,2063,2069,2339,2351,2393,2399,2753,2939,3299,3329,3389,3413,3491,3761

%N Sophie Germain primes whose sum of digits is a prime.

%H Amiram Eldar, <a href="/A118571/b118571.txt">Table of n, a(n) for n = 1..10000</a>

%e 191 is in the sequence because it is a Sophie Germain prime and the sum of its digits 1+9+1 = 11 is a prime.

%t Select[Range[4000], PrimeQ[#] && PrimeQ[2*# + 1] && PrimeQ[Plus @@ IntegerDigits[#]] &] (* _Amiram Eldar_, Feb 08 2021 *)

%Y Intersection of A005384 and A028834.

%Y Subsequence of A046704.

%K base,nonn

%O 1,1

%A Luc Stevens (lms022(AT)yahoo.com), May 07 2006

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Last modified April 19 16:08 EDT 2024. Contains 371794 sequences. (Running on oeis4.)