Every Day Counts
Centred Triangular Prime Days
 
Age: 14,659 days
Date of birth
Your 23rd Centred Triangular Prime Day is on
Monday
when you will be
14,851 days old

A centred triangular prime is a centred triangular number that is prime.

Centred triangular numbers are of the form (3n2 + 3n + 2) / 2

A centred triangular number is a centred figurate number that represents a triangle with a dot in the centre and all other dots surrounding the centre in successive triangular layers.

The figures for the first four centred triangular numbers are shown below:

Remind me, please


Next Prime Events
Day Age
Event
Days Ahead
Year Age
22 Dec 2025
14,669
10
40
04 Mar 2026
14,741
82
40
22 Jun 2026
14,851
192
40
27 Sep 2027
15,313
654
41
24 Dec 2027
15,401
742
42
19 Dec 2029
16,127
1,468
44
27 May 2031
16,651
1,992
45
05 Dec 2031
16,843
2,184
46
19 Sep 2033
17,497
2,838
47
04 Aug 2035
18,181
3,522
49
26 Nov 2038
19,391
4,732
53
25 May 2040
19,937
5,278
54
09 Apr 2064
28,657
13,998
78
08 Jul 2105
43,721
29,062
119
05 Dec 2118
48,619
33,960
133
31 Mar 2165
65,537
50,878
179
14 May 2260
100,279
85,620
274
03 Sep 2344
131,071
116,412
358
Ordinal
Day Age
Date
Age
1st
19
12 Nov 1985
0
2nd
31
24 Nov 1985
0
3rd
109
10 Feb 1986
0
4th
199
11 May 1986
0
5th
409
07 Dec 1986
1
6th
571
18 May 1987
1
7th
631
17 Jul 1987
1
8th
829
31 Jan 1988
2
9th
1,489
21 Nov 1989
4
10th
1,999
15 Apr 1991
5
11th
2,341
22 Mar 1992
6
12th
2,971
12 Dec 1993
8
13th
3,529
23 Jun 1995
9
14th
4,621
19 Jun 1998
12
15th
4,789
04 Dec 1998
13
16th
7,039
31 Jan 2005
19
17th
7,669
23 Oct 2006
20
18th
8,779
06 Nov 2009
24
19th
9,721
05 Jun 2012
26
20th
10,459
13 Jun 2014
28
21st
10,711
20 Feb 2015
29
22nd
13,681
09 Apr 2023
37
23rd
14,851
22 Jun 2026
40
1
24th
16,069
22 Oct 2029
43
25th
16,381
30 Aug 2030
44
26th
17,659
28 Feb 2034
48
27th
20,011
07 Aug 2040
54
28th
20,359
21 Jul 2041
55
29th
23,251
21 Jun 2049
63
30th
25,939
30 Oct 2056
71
31st
27,541
20 Mar 2061
75
32nd
29,191
25 Sep 2065
79
33rd
29,611
19 Nov 2066
81
34th
31,321
26 Jul 2071
85
35th
34,429
28 Jan 2080
94
36th
36,739
26 May 2086
100
37th
40,099
07 Aug 2095
109
38th
40,591
11 Dec 2096
111
39th
42,589
02 Jun 2102
116