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URL: https://oeis.org/A110016

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A110016

Numbers n such that (n^2-7)/6 is prime.

5

5, 7, 11, 17, 19, 25, 29, 37, 43, 47, 53, 55, 61, 71, 73, 79, 89, 97, 101, 107, 109, 115, 127, 143, 155, 169, 173, 187, 191, 199, 215, 223, 235, 241, 251, 253, 263, 271, 281, 295, 317, 323, 341, 367, 377, 389, 395, 397, 403, 415, 425, 433, 439, 443, 449, 457

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OFFSET

1,1

COMMENTS

All terms must be odd numbers. - Harvey P. Dale, Jul 02 2019

LINKS

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

FORMULA

a(n) = SQRT(A110015(n)).

MATHEMATICA

Select[Range[1, 500, 2], PrimeQ[(#^2-7)/6]&] (* Harvey P. Dale, Jul 02 2019 *)

PROG

(PARI) is(n)=isprime((n^2-7)/6) \\ Charles R Greathouse IV, Feb 20 2017

CROSSREFS

Cf. A110014, A110015.

Sequence in context: A020582 A106863 A200569 * A254672 A056775 A015917

Adjacent sequences: A110013 A110014 A110015 * A110017 A110018 A110019

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto, Sep 03 2005

EXTENSIONS

Corrected and extended by Ray Chandler, Sep 04 2005

STATUS

approved