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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A101793 16n-1 such that 4n-1, 8n-1 and 16n-1 are primes. 3
47, 719, 1439, 2879, 4079, 4127, 5807, 6047, 7247, 7727, 9839, 10799, 11279, 13967, 14159, 15647, 21599, 24527, 28319, 28607, 42767, 44687, 45887, 48479, 51599, 51839, 67247, 68639, 72767, 77279, 79967, 81647, 84047, 84719, 89087 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..35.

EXAMPLE

4*3-1=11, 8*3-1=23 and 16*3-1=47 are primes, so the first entry is 47.

MATHEMATICA

16#-1&/@Select[Range[10000], AllTrue[{4#-1, 8#-1, 16#-1}, PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Jun 13 2015 *)

CROSSREFS

Cf. A002515, A101790, A101791, A101792.

Sequence in context: A106310 A163709 A244880 * A262120 A032626 A009054

Adjacent sequences:  A101790 A101791 A101792 * A101794 A101795 A101796

KEYWORD

easy,nonn

AUTHOR

Douglas Stones (dssto1(AT)student.monash.edu.au), Dec 16 2004

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 22 22:22 EDT 2019. Contains 322378 sequences. (Running on oeis4.)