This site is supported by donations to The OEIS Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A049481 Both p and p+30 are primes. 11
 7, 11, 13, 17, 23, 29, 31, 37, 41, 43, 53, 59, 67, 71, 73, 79, 83, 97, 101, 107, 109, 127, 137, 149, 151, 163, 167, 181, 193, 197, 199, 211, 227, 233, 239, 241, 251, 263, 277, 281, 283, 307, 317, 337, 349, 353, 359, 367, 379, 389, 401, 409, 419, 431, 433, 449 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 30 = A002110(3) is the 3rd primorial number. p and p+30 are not necessarily consecutive primes. Initial segment of A045320 is identical, but 113 is not in this sequence because 113 + 30 = 143 is divisible by 13. LINKS Harvey P. Dale, Table of n, a(n) for n = 1..10000 EXAMPLE Both 7 and 7 + 2*3*5 = 37 are prime. MATHEMATICA lst={}; Do[p=Prime[n]; If[PrimeQ[p+30], AppendTo[lst, p]], {n, 6!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jan 04 2009 *) Select[Prime[Range[100]], PrimeQ[#+30]&] (* Harvey P. Dale, Apr 28 2012 *) CROSSREFS Cf. A045320, A001359, A023201. Cf. A049482, A049485, A049481, A154114. - Vladimir Joseph Stephan Orlovsky, Jan 04 2009 Sequence in context: A103486 A086843 A260714 * A175412 A173700 A067557 Adjacent sequences:  A049478 A049479 A049480 * A049482 A049483 A049484 KEYWORD nonn AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 16 21:37 EST 2019. Contains 319206 sequences. (Running on oeis4.)