# What are Mersenne numbers?

Are integers of the form MP= 2P -1.

If MP is a prime number, the number P It is also. They are named after their most distinguished scholar, Marin Mersenne. The first ones are the null mersenne (M0 = 0) and the unit (M1 = 1). There are prime and non-prime mersennes, but cousins ​​are the most studied.

There are currently 49 Mersenne prime numbers known. The last one was discovered on January 7th, 2016. Check out the table below.

## List of known Mersenne cousins

#2P-1DigitsYear
122-11500 A.C.
223-11500 A.C.
325-12275 A.C.
427-13275 A.C
5213-141456
6217-161588
7219-161588
8231-1101772
9261-1191883
10289-1271911
112107-1331914
122127-1391876
132521-11571952
142607-11831952
1521,279-13861952
1622,203-16641952
1722,281-16871952
1823,217-19691957
1924,253-11,2811961
2024,423-11,3321961
2129,689-12,9171963
2229,941-12,9931963
23211,213-13,3761963
24219,937-16,0021971
25221,701-16,5331978
26223,209-16,9871979
27244,497-113,3951979
28286,243-125,9621982
292110,503-133,2651988
302132,049-139,7511983
312216,091-165,0501985
322756,839-1227,8321992
332859,433-1258,7161994
3421,257,787-1378,6321996
3521,398,269-1420,9211996
3622,976,221-1895,9321997
3723,021,377-1909,5261998
3826,972,593-12,098,9601999
39213,466,917-14,053,9462001
40220,996,011-16,320,4302003
41224,036,583-17,235,7332004
42225,964,951-17,816,2302005
43230,402,457-19,152,0522005
44232,582,657-19,808,3582006
45237,156,667-111,185,2722008
46242,643,801-112,837,0642009
47243,112,609-112,978,1892008
48257,885,161-117,425,1702013
49274,207,281-122,338,6182016