Every Day Counts
Mersenne Prime Exponent Days
 
Age: 19,941 days
Date of birth
Your 25th Mersenne Prime Exponent Day is on
Thursday
when you will be
21,701 days old

These are primes p such that 2p - 1 is prime.

For Mersenne Prime Days see Mersenne Prime Days.

Remind me, please


Next Prime Events
Day Age
Event
Days Ahead
Year Age
31 Jul 2018
19,949
8
54
11 Sep 2018
19,991
50
54
01 Oct 2018
20,011
70
54
09 Apr 2019
20,201
260
55
12 Sep 2019
20,357
416
55
18 May 2023
21,701
1,760
59
02 Jun 2025
22,447
2,506
61
03 Jun 2042
28,657
8,716
78
22 Oct 2065
37,199
17,258
101
29 Sep 2071
39,367
19,426
107
31 Aug 2083
43,721
23,780
119
27 Jan 2097
48,619
28,678
133
25 May 2143
65,537
45,596
179
08 Jul 2238
100,279
80,338
274
25 Jan 2262
108,881
88,940
298
28 Oct 2322
131,071
111,130
358
18 Feb 7781
2,124,679
2,104,738
5817
Ordinal
Day Age
Date
Age
1st
2
20 Dec 1963
0
2nd
3
21 Dec 1963
0
3rd
5
23 Dec 1963
0
4th
7
25 Dec 1963
0
5th
13
31 Dec 1963
0
6th
17
04 Jan 1964
0
7th
19
06 Jan 1964
0
8th
31
18 Jan 1964
0
9th
61
17 Feb 1964
0
10th
89
16 Mar 1964
0
11th
107
03 Apr 1964
0
12th
127
23 Apr 1964
0
13th
521
22 May 1965
1
14th
607
16 Aug 1965
1
15th
1,279
19 Jun 1967
3
16th
2,203
29 Dec 1969
6
17th
2,281
17 Mar 1970
6
18th
3,217
08 Oct 1972
8
19th
4,253
10 Aug 1975
11
20th
4,423
27 Jan 1976
12
21st
9,689
28 Jun 1990
26
22nd
9,941
07 Mar 1991
27
23rd
11,213
30 Aug 1994
30
24th
19,937
19 Jul 2018
54
25th
21,701
18 May 2023
59
1
26th
23,209
04 Jul 2027
63
27th
44,497
15 Oct 2085
121
28th
86,243
01 Feb 2200
236