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A154111 Numbers n such that (n+1)^2 - n^3 is a (positive or negative) prime. 4
1, 3, 5, 6, 8, 11, 12, 15, 18, 20, 27, 33, 35, 39, 41, 45, 48, 50, 54, 65, 66, 68, 86, 87, 92, 96, 99, 107, 116, 122, 123, 126, 138, 140, 149, 150, 156, 159, 161, 164, 165, 167, 170, 177, 182, 185, 188, 191, 192, 198, 200, 207, 209, 219, 228, 237, 239, 240, 242, 252 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..2000

MATHEMATICA

Select[Range[300], PrimeQ[(#+1)^2-#^3]&] (* Harvey P. Dale, Dec 06 2015 *)

PROG

(MAGMA) [n: n in [0..500] | IsPrime((n+1)^2-n^3)] # Vincenzo Librandi, Nov 26 2010

(PARI) is(n)=isprime(abs((n+1)^2 - n^3)) \\ Charles R Greathouse IV, Sep 02 2016

CROSSREFS

Cf. A140719, A005097.

Sequence in context: A301744 A087720 A309544 * A047444 A279933 A327206

Adjacent sequences:  A154108 A154109 A154110 * A154112 A154113 A154114

KEYWORD

nonn,easy

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jan 04 2009

STATUS

approved

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Last modified September 16 23:53 EDT 2021. Contains 347477 sequences. (Running on oeis4.)