Every Day Counts
Centred Triangular Prime Days
 
Age: 14,836 days
Date of birth
Your 23rd Centred Triangular Prime Day is on
Friday
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
08 Jan 2026
14,843
7
40
16 Jan 2026
14,851
15
40
23 Apr 2027
15,313
477
41
20 Jul 2027
15,401
565
42
08 Sep 2027
15,451
615
42
15 Jul 2029
16,127
1,291
44
21 Dec 2030
16,651
1,815
45
01 Jul 2031
16,843
2,007
46
15 Apr 2033
17,497
2,661
47
28 Feb 2035
18,181
3,345
49
22 Jun 2038
19,391
4,555
53
20 Dec 2039
19,937
5,101
54
04 Nov 2063
28,657
13,821
78
01 Feb 2105
43,721
28,885
119
01 Jul 2118
48,619
33,783
133
25 Oct 2164
65,537
50,701
179
09 Dec 2259
100,279
85,443
274
30 Mar 2344
131,071
116,235
358
Ordinal
Day Age
Date
Age
1st
19
08 Jun 1985
0
2nd
31
20 Jun 1985
0
3rd
109
06 Sep 1985
0
4th
199
05 Dec 1985
0
5th
409
03 Jul 1986
1
6th
571
12 Dec 1986
1
7th
631
10 Feb 1987
1
8th
829
27 Aug 1987
2
9th
1,489
17 Jun 1989
4
10th
1,999
09 Nov 1990
5
11th
2,341
17 Oct 1991
6
12th
2,971
08 Jul 1993
8
13th
3,529
17 Jan 1995
9
14th
4,621
13 Jan 1998
12
15th
4,789
30 Jun 1998
13
16th
7,039
27 Aug 2004
19
17th
7,669
19 May 2006
20
18th
8,779
02 Jun 2009
24
19th
9,721
31 Dec 2011
26
20th
10,459
07 Jan 2014
28
21st
10,711
16 Sep 2014
29
22nd
13,681
03 Nov 2022
37
23rd
14,851
16 Jan 2026
40
1
24th
16,069
18 May 2029
43
25th
16,381
26 Mar 2030
44
26th
17,659
24 Sep 2033
48
27th
20,011
03 Mar 2040
54
28th
20,359
14 Feb 2041
55
29th
23,251
15 Jan 2049
63
30th
25,939
26 May 2056
71
31st
27,541
14 Oct 2060
75
32nd
29,191
21 Apr 2065
79
33rd
29,611
15 Jun 2066
81
34th
31,321
19 Feb 2071
85
35th
34,429
24 Aug 2079
94
36th
36,739
20 Dec 2085
100
37th
40,099
03 Mar 2095
109
38th
40,591
07 Jul 2096
111
39th
42,589
27 Dec 2101
116