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 A262098 Primes p such that 2^p + 9 is also prime. 5
 2, 3, 5, 7, 23, 37, 47, 263, 317, 3229, 3253 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(12) > 100000. - Dana Jacobsen, Oct 03 2015 LINKS EXAMPLE 5 is in sequence because 2^5 + 9 = 41 is prime. MATHEMATICA Select[Prime[Range[1000]], PrimeQ[2^# + 9] &] PROG (MAGMA) [p: p in PrimesUpTo(1000) | IsPrime(2^p+9)]; (PARI) for(n=1, 1e3, if(isprime((2^prime(n))+9), print1(prime(n)", "))) \\ Altug Alkan, Sep 18 2015 (Perl) use ntheory ":all"; use Math::GMP qw/:constant/; forprimes { say if is_prime(2**\$_+9) } 10000; # Dana Jacobsen, Oct 03 2015 CROSSREFS Subsequence of primes of A057196. Cf. primes p such that 2^p+k is a prime: A057736 (k=3), A175173 (k=5), this sequence (k=9), A155780 (k=11), A175234 (k=15), A262099 (k=17), A175235 (k=21), A175236 (k=23), A262934 (k=27), A262100 (k=29), A262201 (k=33), A262962 (k=35). Sequence in context: A113611 A038925 A154761 * A074491 A154385 A125525 Adjacent sequences:  A262095 A262096 A262097 * A262099 A262100 A262101 KEYWORD nonn,more AUTHOR Vincenzo Librandi, Sep 18 2015 STATUS approved

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Last modified September 30 23:44 EDT 2020. Contains 337440 sequences. (Running on oeis4.)