|
| |
|
|
A132190
|
|
Numbers n such that 7*n^2 + 1 is prime.
|
|
1
| |
|
|
2, 4, 8, 10, 12, 14, 18, 20, 22, 26, 30, 34, 44, 46, 58, 66, 68, 70, 74, 76, 78, 84, 90, 96, 100, 106, 108, 110, 120, 128, 134, 140, 146, 152, 154, 156, 158, 162, 164, 168, 174, 184, 186, 188, 196, 200, 202, 210, 216, 228, 232, 238, 250, 252, 260, 262, 264, 268
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
EXAMPLE
| If n=2 then 7*n^2 + 1 = 29 (prime).
If n=100 then 7*n^2 + 1 = 70001 (prime).
|
|
|
MATHEMATICA
| Select[Range[300], PrimeQ[7*#^2 + 1] &] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jan 02 2008
|
|
|
PROG
| (MAGMA) [ n: n in [0..500] | IsPrime(7*n^2 + 1) ] [From Vincenzo Librandi, Jan 31 2011]
|
|
|
CROSSREFS
| Cf. A111051.
Sequence in context: A206928 A133012 A039011 * A155037 A001770 A032494
Adjacent sequences: A132187 A132188 A132189 * A132191 A132192 A132193
|
|
|
KEYWORD
| nonn,easy
|
|
|
AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Nov 05 2007
|
|
|
EXTENSIONS
| More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jan 02 2008
|
| |
|
|
