Every Day Counts
Centred Triangular Prime Days
 
Age: 16,067 days
Date of birth
Your 24th Centred Triangular Prime Day is on
Tuesday
when you will be
16,069 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
31 Aug 2025
16,067
today
43
02 Sep 2025
16,069
2
43
30 Oct 2025
16,127
60
44
21 Jun 2026
16,361
294
44
11 Jul 2026
16,381
314
44
11 Jul 2026
16,381
314
44
07 Apr 2027
16,651
584
45
16 Oct 2027
16,843
776
46
31 Jul 2029
17,497
1,430
47
15 Jun 2031
18,181
2,114
49
07 Oct 2034
19,391
3,324
53
05 Apr 2036
19,937
3,870
54
19 Feb 2060
28,657
12,590
78
19 May 2101
43,721
27,654
119
16 Oct 2114
48,619
32,552
133
09 Feb 2161
65,537
49,470
179
25 Mar 2256
100,279
84,212
274
15 Jul 2340
131,071
115,004
358
Ordinal
Day Age
Date
Age
1st
19
23 Sep 1981
0
2nd
31
05 Oct 1981
0
3rd
109
22 Dec 1981
0
4th
199
22 Mar 1982
0
5th
409
18 Oct 1982
1
6th
571
29 Mar 1983
1
7th
631
28 May 1983
1
8th
829
12 Dec 1983
2
9th
1,489
02 Oct 1985
4
10th
1,999
24 Feb 1987
5
11th
2,341
01 Feb 1988
6
12th
2,971
23 Oct 1989
8
13th
3,529
04 May 1991
9
14th
4,621
30 Apr 1994
12
15th
4,789
15 Oct 1994
13
16th
7,039
12 Dec 2000
19
17th
7,669
03 Sep 2002
20
18th
8,779
17 Sep 2005
24
19th
9,721
16 Apr 2008
26
20th
10,459
24 Apr 2010
28
21st
10,711
01 Jan 2011
29
22nd
13,681
18 Feb 2019
37
23rd
14,851
03 May 2022
40
24th
16,069
02 Sep 2025
43
1
25th
16,381
11 Jul 2026
44
26th
17,659
09 Jan 2030
48
27th
20,011
18 Jun 2036
54
28th
20,359
01 Jun 2037
55
29th
23,251
02 May 2045
63
30th
25,939
10 Sep 2052
71
31st
27,541
29 Jan 2057
75
32nd
29,191
06 Aug 2061
79
33rd
29,611
30 Sep 2062
81
34th
31,321
06 Jun 2067
85
35th
34,429
09 Dec 2075
94
36th
36,739
06 Apr 2082
100
37th
40,099
18 Jun 2091
109
38th
40,591
22 Oct 2092
111
39th
42,589
12 Apr 2098
116