login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145174 Least a(n) such that p(n)#*(p(n)#-a(n))-1 and p(n)#*(p(n)#-a(n))+1 are twin primes with p(i)#=i-th primorial 1
0, 1, 3, 1, 5, 4, 44, 13, 31, 173, 25, 19, 75, 99, 47, 77, 166, 468, 43, 1, 344, 7, 44, 398, 434, 901, 246, 246, 91, 755, 1066, 839, 1605, 560, 460, 1649, 426, 1203, 732, 1055, 130, 1821, 1645, 360, 4779, 2414, 272, 668, 2410, 3957, 2514, 685, 3484, 3139, 5680 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
2*3*(2*3-1)-1=29 prime as 31 so a(2)=1
CROSSREFS
Sequence in context: A007085 A094648 A096975 * A351965 A228785 A135184
KEYWORD
nonn
AUTHOR
Pierre CAMI, Oct 03 2008
EXTENSIONS
Corrected and extended by Ray Chandler, Jan 12 2009
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 16:12 EDT 2024. Contains 371254 sequences. (Running on oeis4.)