Every Day Counts
Centred Triangular Prime Days
 
Age: 14,838 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
14 Nov 2025
14,843
5
40
22 Nov 2025
14,851
13
40
27 Feb 2027
15,313
475
41
26 May 2027
15,401
563
42
15 Jul 2027
15,451
613
42
21 May 2029
16,127
1,289
44
27 Oct 2030
16,651
1,813
45
07 May 2031
16,843
2,005
46
19 Feb 2033
17,497
2,659
47
04 Jan 2035
18,181
3,343
49
28 Apr 2038
19,391
4,553
53
26 Oct 2039
19,937
5,099
54
10 Sep 2063
28,657
13,819
78
08 Dec 2104
43,721
28,883
119
07 May 2118
48,619
33,781
133
31 Aug 2164
65,537
50,699
179
15 Oct 2259
100,279
85,441
274
04 Feb 2344
131,071
116,233
358
Ordinal
Day Age
Date
Age
1st
19
14 Apr 1985
0
2nd
31
26 Apr 1985
0
3rd
109
13 Jul 1985
0
4th
199
11 Oct 1985
0
5th
409
09 May 1986
1
6th
571
18 Oct 1986
1
7th
631
17 Dec 1986
1
8th
829
03 Jul 1987
2
9th
1,489
23 Apr 1989
4
10th
1,999
15 Sep 1990
5
11th
2,341
23 Aug 1991
6
12th
2,971
14 May 1993
8
13th
3,529
23 Nov 1994
9
14th
4,621
19 Nov 1997
12
15th
4,789
06 May 1998
13
16th
7,039
03 Jul 2004
19
17th
7,669
25 Mar 2006
20
18th
8,779
08 Apr 2009
24
19th
9,721
06 Nov 2011
26
20th
10,459
13 Nov 2013
28
21st
10,711
23 Jul 2014
29
22nd
13,681
09 Sep 2022
37
23rd
14,851
22 Nov 2025
40
1
24th
16,069
24 Mar 2029
43
25th
16,381
30 Jan 2030
44
26th
17,659
31 Jul 2033
48
27th
20,011
08 Jan 2040
54
28th
20,359
21 Dec 2040
55
29th
23,251
21 Nov 2048
63
30th
25,939
01 Apr 2056
71
31st
27,541
20 Aug 2060
75
32nd
29,191
25 Feb 2065
79
33rd
29,611
21 Apr 2066
81
34th
31,321
26 Dec 2070
85
35th
34,429
30 Jun 2079
94
36th
36,739
26 Oct 2085
100
37th
40,099
07 Jan 2095
109
38th
40,591
13 May 2096
111
39th
42,589
02 Nov 2101
116