login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A260808 Primes p such that p = q^2 - 12*r^2 where q and r are also primes. 5
61, 73, 181, 229, 241, 313, 373, 421, 541, 661, 733, 757, 853, 1069, 1093, 1321, 1381, 1453, 1549, 1621, 1693, 1741, 1801, 1861, 2029, 2161, 2221, 2269, 2557, 3037, 3061, 3181, 3301, 3373, 3433, 3613, 3673, 3853, 3877, 4261, 4441, 4597, 4789, 4861, 4933 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Colin Barker, Table of n, a(n) for n = 1..1000

EXAMPLE

61 is in the sequence because 61 = 13^2 - 12*3^2 and 61, 13 and 3 are all primes.

CROSSREFS

Cf. A260805, A260806, A260807, A260809.

Sequence in context: A227980 A227520 A033236 * A141457 A112998 A328160

Adjacent sequences:  A260805 A260806 A260807 * A260809 A260810 A260811

KEYWORD

nonn

AUTHOR

Colin Barker, Jul 31 2015

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 September 20 01:54 EDT 2020. Contains 337260 sequences. (Running on oeis4.)