A087191 Primes of the form k^4 - (k+1)^3.

17, 131, 409, 953, 1889, 8669, 18539, 60623, 77689, 122321, 373049, 437293, 590267, 2249441, 8975009, 9649303, 11111117, 14526289, 19836689, 26484839, 31201649, 56608289, 67796273, 80565889, 84021983, 87588089, 107150489, 150402113

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Example

a(2) = 4^4 - (4+1)^3 = 256 - 125 = 131.

Mathematica

Select[Table[n^4-(n+1)^3, {n, 3, 101900}], PrimeQ] (* Vincenzo Librandi, Dec 10 2011 *)

Prog

(Magma) [a: n in [3..120] | IsPrime(a) where a is n^4-(n+1)^3]; // Vincenzo Librandi, Dec 10 2011

Crossrefs

Cf. A087190 n such that n^4-(n+1)^3 is prime.

Sequence in context: A179818 A138640 A142676 * A158959 A355052 A259418

Adjacent sequences: A087188 A087189 A087190 * A087192 A087193 A087194

Keyword

nonn,easy

Author

Hugo Pfoertner, Aug 24 2003

Status

approved