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A110999 Numbers n such that 23*n^2 - 16 is prime. 0
1, 3, 9, 11, 19, 33, 45, 49, 53, 65, 67, 77, 79, 87, 89, 121, 123, 129, 137, 157, 159, 163, 165, 179, 193, 199, 201, 215, 217, 219, 221, 233, 241, 243, 261, 269, 273, 275, 285, 299, 311, 319, 347, 355, 373, 413, 415, 423, 427, 443, 445, 453, 457, 459, 467, 483 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

If n=89 then (23*n^2) - 16 = 182167 (prime).

PROG

(MAGMA) [n: n in [0..100000] |IsPrime((23*n^2)-16)] // Vincenzo Librandi, Nov 13 2010

(PARI) is(n)=isprime(23*n^2-16) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A111211 A144181 A004626 * A179867 A032671 A331029

Adjacent sequences:  A110996 A110997 A110998 * A111000 A111001 A111002

KEYWORD

nonn,easy

AUTHOR

Parthasarathy Nambi, Sep 30 2005

STATUS

approved

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Last modified June 25 03:09 EDT 2021. Contains 345449 sequences. (Running on oeis4.)