login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A139443 Numbers n such that primorial(n)/2 + 16 is prime. 5
1, 2, 3, 5, 6, 8, 13, 25, 26, 30, 34, 63, 75, 138, 149, 672, 752, 1067, 1256, 1370, 3357, 4120, 6672, 7201, 7469, 8738, 9426, 11608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(29) > 25000. - Robert Price, Dec 08 2016

LINKS

Table of n, a(n) for n=1..28.

MATHEMATICA

k = 1/2; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k + 16], Print[n]; AppendTo[a, n]], {n, 752}]; a

CROSSREFS

Cf. A067026, A067027, A139439-A139457, A103514.

Sequence in context: A050028 A239135 A179791 * A239263 A216293 A088497

Adjacent sequences:  A139440 A139441 A139442 * A139444 A139445 A139446

KEYWORD

nonn

AUTHOR

Artur Jasinski, Apr 21 2008

EXTENSIONS

a(1)=1 inserted and program corrected, a(18)-a(20) from Ray Chandler, Jun 16 2013

a(21)-a(28) from Robert Price, Dec 08 2016

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified June 28 13:24 EDT 2017. Contains 288838 sequences.