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A027757 Numbers n such that n^2 + n + 9 is prime. 3
1, 4, 13, 16, 19, 25, 28, 43, 49, 55, 76, 79, 88, 106, 118, 121, 139, 145, 151, 154, 175, 190, 205, 208, 211, 235, 238, 253, 259, 268, 271, 301, 310, 370, 373, 376, 391, 400, 403, 415, 433, 445, 484, 490, 508, 511, 523, 544, 568, 580, 583, 589, 610, 643, 664, 676, 685, 706, 718, 721, 736, 739, 751, 769, 784, 796, 841, 844, 853, 868, 901, 916, 919, 931, 964, 970, 973, 1003, 1033, 1051, 1075, 1093, 1096, 1114, 1129, 1141, 1150, 1171, 1180, 1198, 1225, 1243, 1246, 1261, 1306, 1324, 1330, 1339, 1360, 1363, 1390, 1393, 1405, 1408, 1423, 1429, 1444 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

P. De Geest, World!Of Numbers

MATHEMATICA

Select[Range[2500], PrimeQ[#^2+#+9]&]

PROG

(MAGMA) [n: n in [0..1000] |IsPrime(n^2+n+9)] [From Vincenzo Librandi, Nov 20 2010]

CROSSREFS

Sequence in context: A106681 A144947 A022416 * A165336 A031181 A074262

Adjacent sequences:  A027754 A027755 A027756 * A027758 A027759 A027760

KEYWORD

nonn

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com)

EXTENSIONS

Additional terms provided and Mathematica program provided by Harvey P. Dale, Dec. 1, 2010

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Last modified February 13 06:53 EST 2012. Contains 205451 sequences.