Every Day Counts
Centred Triangular Prime Days
 
Age: 14,836 days
Date of birth
Your 23rd Centred Triangular Prime Day is on
Saturday
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
18 Sep 2026
14,843
7
40
26 Sep 2026
14,851
15
40
01 Jan 2028
15,313
477
41
29 Mar 2028
15,401
565
42
18 May 2028
15,451
615
42
25 Mar 2030
16,127
1,291
44
31 Aug 2031
16,651
1,815
45
10 Mar 2032
16,843
2,007
46
24 Dec 2033
17,497
2,661
47
08 Nov 2035
18,181
3,345
49
02 Mar 2039
19,391
4,555
53
29 Aug 2040
19,937
5,101
54
14 Jul 2064
28,657
13,821
78
12 Oct 2105
43,721
28,885
119
11 Mar 2119
48,619
33,783
133
05 Jul 2165
65,537
50,701
179
18 Aug 2260
100,279
85,443
274
08 Dec 2344
131,071
116,235
358
Ordinal
Day Age
Date
Age
1st
19
16 Feb 1986
0
2nd
31
28 Feb 1986
0
3rd
109
17 May 1986
0
4th
199
15 Aug 1986
0
5th
409
13 Mar 1987
1
6th
571
22 Aug 1987
1
7th
631
21 Oct 1987
1
8th
829
06 May 1988
2
9th
1,489
25 Feb 1990
4
10th
1,999
20 Jul 1991
5
11th
2,341
26 Jun 1992
6
12th
2,971
18 Mar 1994
8
13th
3,529
27 Sep 1995
9
14th
4,621
23 Sep 1998
12
15th
4,789
10 Mar 1999
13
16th
7,039
07 May 2005
19
17th
7,669
27 Jan 2007
20
18th
8,779
10 Feb 2010
24
19th
9,721
09 Sep 2012
26
20th
10,459
17 Sep 2014
28
21st
10,711
27 May 2015
29
22nd
13,681
14 Jul 2023
37
23rd
14,851
26 Sep 2026
40
1
24th
16,069
26 Jan 2030
43
25th
16,381
04 Dec 2030
44
26th
17,659
04 Jun 2034
48
27th
20,011
11 Nov 2040
54
28th
20,359
25 Oct 2041
55
29th
23,251
25 Sep 2049
63
30th
25,939
03 Feb 2057
71
31st
27,541
24 Jun 2061
75
32nd
29,191
30 Dec 2065
79
33rd
29,611
23 Feb 2067
81
34th
31,321
30 Oct 2071
85
35th
34,429
03 May 2080
94
36th
36,739
30 Aug 2086
100
37th
40,099
11 Nov 2095
109
38th
40,591
17 Mar 2097
111
39th
42,589
06 Sep 2102
116