

A062288


Numbers k such that prime(k)+50 is also prime.


2



2, 5, 7, 9, 10, 15, 16, 17, 24, 26, 28, 30, 32, 35, 40, 41, 43, 49, 51, 55, 56, 60, 66, 69, 72, 76, 77, 87, 94, 98, 102, 103, 104, 108, 116, 120, 123, 124, 126, 128, 135, 137, 140, 144, 148, 154, 160, 161, 164, 166, 170, 171, 185, 190, 192, 194, 195, 201, 206, 220
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OFFSET

1,1


COMMENTS

"Numerical evidence makes it plausible that there are infinitely many primes p such that p + 50 is also prime."  Burton, p. 52.


REFERENCES

D. M. Burton, Elementary Number Theory, Allyn and Bacon, Inc., Boston, MA, 1976, pp. 52.


LINKS

Harry J. Smith, Table of n, a(n) for n = 1..1000


MATHEMATICA

Select[Range[400], PrimeQ[Prime[#]+50]&] (* Harvey P. Dale, Mar 01 2011 *)


PROG

(PARI) for(n=1, 65, if(isprime(prime(n)+50), print(n)))
(PARI) { n=m=0; forprime (p=2, 10^5, m++; if (isprime(p + 50), write("b062288.txt", n++, " ", m); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 04 2009


CROSSREFS

Cf. A062284.
Sequence in context: A181713 A047482 A174272 * A077059 A260166 A007300
Adjacent sequences: A062285 A062286 A062287 * A062289 A062290 A062291


KEYWORD

easy,nonn


AUTHOR

Jason Earls, Jul 02 2001


EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), Jul 05 2001


STATUS

approved



