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!)
A181669 Primes p of the form 6n-1 such that p-1 is a semiprime and p+2 is prime or prime squared. 6
5, 11, 23, 47, 59, 107, 167, 179, 227, 347, 359, 839, 1019, 1319, 1367, 1487, 1619, 2027, 2207, 2999, 3119, 3167, 3467, 4127, 4259, 4547, 4787, 4799, 5099, 5639, 5879, 6659, 6779, 6827, 7559, 8819, 10007, 10607, 11699, 12107, 12539, 14387, 14867, 15287, 15647 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Except term 7, same as A181602.
LINKS
MATHEMATICA
Select[6*Range[3000]-1, PrimeQ[#]&&PrimeOmega[#-1]==2&&AnyTrue[ {#+2, Sqrt[ #+2]}, PrimeQ]&] (* Harvey P. Dale, Jul 01 2022 *)
CROSSREFS
Sequence in context: A337437 A107010 A175942 * A362082 A306662 A052940
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Nov 18 2010
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 19 04:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)