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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A320752 Primes of the form 5*n^2 - 5*n + 13. 0
 13, 23, 43, 73, 113, 163, 223, 293, 373, 463, 563, 673, 1063, 1213, 1373, 1543, 1723, 1913, 2113, 2543, 3793, 4073, 4363, 4663, 4973, 5623, 6673, 7043, 8623, 9043, 9473, 12263, 12763, 14323, 15413, 15973, 17123, 17713, 18313, 19543, 20173, 22123, 23473, 26293 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The first 12 numbers of the form 5*n^2 - 5*n + 13 (n=1 to 12) are primes. LINKS MAPLE select(isprime, [seq(5*n^2-5*n+13, n=1..75)]); # Muniru A Asiru, Oct 21 2018 PROG (PARI) terms(n) = my(i=0); for(k=1, oo, my(x=5*k^2-5*k+13); if(ispseudoprime(x), print1(x, ", "); i++); if(i==n, break)) /* Print initial 50 terms as follows */ terms(50) \\ Felix Fröhlich, Oct 20 2018 (GAP) Filtered(List([1..75], n->5*n^2-5*n+13), IsPrime); # Muniru A Asiru, Oct 21 2018 CROSSREFS Cf. A090562. Sequence in context: A067227 A240113 A256177 * A213665 A068712 A103166 Adjacent sequences:  A320749 A320750 A320751 * A320753 A320754 A320755 KEYWORD nonn AUTHOR Arashdeep Singh, Oct 20 2018 EXTENSIONS More terms from Felix Fröhlich, Oct 20 2018 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.

Last modified August 3 17:17 EDT 2021. Contains 346439 sequences. (Running on oeis4.)