### The Eisenstein Primes

While working on a nBAB about the 233, MathBabbler learned that 233 was an Eisenstein prime.

```   Eisenstein primes are of the form 3n - 1,
where n is a positive integer

2,   5,  11,  17,  23,  29,  41,  47,  53,  59,  71,  83,
89, 101, 107, 113, 131, 137, 149, 167, 173, 179, 191, 197,
227, 233, 239, 251, 257, 263, 269, 281, 293, 311, 317, 347,
353, 359, 383, 389, 401, 419, 431, 443, 449, 461, 467, 479,
491, 503, 509, 521, 557, 563, 569, 587, 593, ..., 719, ...,
1109, ..., 1433, ..., 1499, ..., 1601, ..., 1637, ..., 1709,
..., 1787, ..., 1979, ..., 2003, ..., 2063, ..., 2417, ...,
2549, ..., 2657, ..., 2699, ..., 2999, ..., 3299, ..., 3323,
..., 3701, ..., 10607, ..., 8675309, ...
```

OEIS.org::id:003627

641, ... 647, ... 653, ... 659, ... 1091, ... 1901, ... 1907, ... 1949, ... 1997, ... 2027, ... 2957, ... 3023, ... 4001, ... 4139, ... 4217, ... 4271, ... 91019, ... 91997, ... 92003, ... 92009, ... 93239, ...
``` + added 113 on 21 June 2009 + added 593 on 11 July 2009 + added 191 on 11 July 2009 + added 197 on 13 July 2009 + added 1787 on 17 September 2009 + added 1109 on 19 September 2009 + added 1709 on 14 October 2009 + added 107 on 11 November 2009 + added 2549 on 18 November 2009 + added 2999 on 23 November 2009 + added 131 on 07 December 2009 + added 2657 on 11 January 2010 + added 1637 on 03 February 2010 + added 2699 on 06 February 2010 + added 137 on 17 February 2010 + added 179 on 15 May 2010 + added 509 on 31 October 2010 + added 503 on 31 October 2010 + added 479 on 31 October 2010 + added 1499 on 16 May 2011 + added 2417 on 22 September 2011 + added 3299 on 23 January 2012 + added 3323 on 08 March 2012 + added 251 on 27 June 2012 + added 281 on 27 June 2012 + added 149 on 27 August 2012 + added 1979 on 09 September 2012 + added 401 on 15 November 2012 + added 1601 on 03 March 2013 + added 1433 on 13 May 2013 + added 257 on 15 September 2013 + added 719 on 20 October 2013 + added 3701 on 12 November 2013 + added 347 on 12 November 2013 + added 10607 on 27 December 2013 + added 2003 on 29 December 2013 + added 8675309 on 12 February 2014 + added 2063 on 05 April 2014 + added 4139 on 03 January 2015 + added 4217 on 21 February 2015 + added 167 on 23 February 2015 + added 1901 on 26 March 2015 + added 1091 on 26 March 2015 + added 173 on 02 May 2015 + added 227 on 10 May 2015 + added 91019 on 22 May 2015 + added 1949 on 29 August 2015 + added 1997 on 12 September 2015 + added 2027 on 13 September 2015 + added 263 on 16 September 2015 + added 239 on 16 September 2015 + added 92009 on 21 September 2015 + added 91977 on 21 September 2015 + added 92003 on 21 September 2015 + added 659 on 24 September 2015 + added 653 on 24 September 2015 + added 647 on 24 September 2015 + added 641 on 24 September 2015 + added 317 on 13 November 2015 + added 4001 on 20 November 2015 + added 2957 on 22 November 2015 + added 93239 on 30 November 2015 + added 4799 on 06 January 2016 + added 21419 on 18 January 2016 + added 3023 on 27 January 2016 + added 94049 on 01 February 2016 + added 94349 on 20 February 2016 + added 94649 on 08 March 2016 + added 15551 on 29 March 2016 + added 94959 on 31 March 2016 + added 269 on 07 April 2016 + added 293 on 10 April 2016 + added 1907 on 17 April 2016 + added 311 on 29 April 2016 + added 70607 on 06 May 2016 + added 96269 on 27 May 2016 + added 19991 on 06 July 2016 + added 97379 on 06 July 2016 + added 353 on 15 September 2016 + added 359 on 27 December 2016 + added 4271 on 31 December 2016 + added 383 on 03 January 2017 + added 389 on 03 January 2017 + added 72227 on 07 January 2017 + added 73037 on 18 March 2017 + added 491 on 30 March 2017 + added 73637 on 23 March 2017 + added 419 on 02 May 2017 + added 431 on 07 May 2017 + added 74747 on 06 June 2017 + added 75557 on 08 June 2017 + added 76367 on 10 June 2017 + added 76667 on 10 June 2017 + added 77477 on 11 June 2017 + added 78887 on 10 August 2017 + added 79397 on 11 August 2017 + added 79997 on 11 August 2017 + added 443 on 30 December 2017 + added 449 on 31 December 2017 + added 461 on 06 January 2018 + added 467 on 03 March 2018 + added 521 on 27 March 2018 ```