A057015 Numbers n such that n^2 + 1, n^2 + 3, n^2 + 7 and n^2 + 9 are all primes.

2, 10, 1420, 2080, 2600, 20500, 22630, 46960, 65300, 81610, 153560, 173590, 187330, 195290, 238850, 255230, 301690, 315410, 316250, 346580, 395860, 398710, 439750, 496220, 498550, 506360, 555110, 609400, 618580, 872950, 927070

Offset

1,1

Links

Table of n, a(n) for n=1..31.

Mathematica

Select[ Range[ 2, 10^6, 2 ], PrimeQ[ #^2 + 1 ] && PrimeQ[ #^2 + 3 ] && PrimeQ[ #^2 + 7 ] && PrimeQ[ #^2 + 9 ] & ]
 Select[Range[2, 1000000, 2], And@@PrimeQ[#^2+{1, 3, 7, 9}]&](* Harvey P. Dale, Oct 03 2012 *)

Crossrefs

Sequence in context: A171485 A291882 A215650 * A059732 A334575 A000884

Adjacent sequences: A057012 A057013 A057014 * A057016 A057017 A057018

Keyword

nonn

Author

Robert G. Wilson v, Sep 09 2000

Status

approved