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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110480 Numbers n such that (n^2+6)/5 is prime. 3
2, 3, 7, 17, 23, 47, 53, 77, 133, 143, 157, 173, 193, 203, 217, 233, 247, 343, 347, 353, 373, 383, 427, 443, 457, 493, 527, 577, 583, 707, 767, 817, 823, 847, 857, 893, 907, 973, 1003, 1067, 1117, 1127, 1153, 1193, 1207, 1223, 1243, 1253, 1277, 1333, 1397 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = Sqrt(A110481(n)).

MATHEMATICA

Select[Range[1500], PrimeQ[(#^2+6)/5]&] (* Harvey P. Dale, May 24 2013 *)

PROG

(PARI) is(n)=isprime((n^2+6)/5) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

Cf. A110481, A110482.

Sequence in context: A113425 A289379 A245590 * A268539 A083822 A030086

Adjacent sequences:  A110477 A110478 A110479 * A110481 A110482 A110483

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Sep 09 2005

EXTENSIONS

Corrected and extended by Rick L. Shepherd and Ray Chandler, Sep 12 2005

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 October 23 10:00 EDT 2019. Contains 328345 sequences. (Running on oeis4.)