Every Day Counts
Centred Triangular Prime Days
 
Age: 14,833 days
Date of birth
Your 23rd Centred Triangular Prime Day is on
Thursday
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 Feb 2026
14,843
10
40
26 Feb 2026
14,851
18
40
03 Jun 2027
15,313
480
41
30 Aug 2027
15,401
568
42
19 Oct 2027
15,451
618
42
25 Aug 2029
16,127
1,294
44
31 Jan 2031
16,651
1,818
45
11 Aug 2031
16,843
2,010
46
26 May 2033
17,497
2,664
47
10 Apr 2035
18,181
3,348
49
02 Aug 2038
19,391
4,558
53
30 Jan 2040
19,937
5,104
54
15 Dec 2063
28,657
13,824
78
14 Mar 2105
43,721
28,888
119
11 Aug 2118
48,619
33,786
133
05 Dec 2164
65,537
50,704
179
19 Jan 2260
100,279
85,446
274
10 May 2344
131,071
116,238
358
Ordinal
Day Age
Date
Age
1st
19
19 Jul 1985
0
2nd
31
31 Jul 1985
0
3rd
109
17 Oct 1985
0
4th
199
15 Jan 1986
0
5th
409
13 Aug 1986
1
6th
571
22 Jan 1987
1
7th
631
23 Mar 1987
1
8th
829
07 Oct 1987
2
9th
1,489
28 Jul 1989
4
10th
1,999
20 Dec 1990
5
11th
2,341
27 Nov 1991
6
12th
2,971
18 Aug 1993
8
13th
3,529
27 Feb 1995
9
14th
4,621
23 Feb 1998
12
15th
4,789
10 Aug 1998
13
16th
7,039
07 Oct 2004
19
17th
7,669
29 Jun 2006
20
18th
8,779
13 Jul 2009
24
19th
9,721
10 Feb 2012
26
20th
10,459
17 Feb 2014
28
21st
10,711
27 Oct 2014
29
22nd
13,681
14 Dec 2022
37
23rd
14,851
26 Feb 2026
40
1
24th
16,069
28 Jun 2029
43
25th
16,381
06 May 2030
44
26th
17,659
04 Nov 2033
48
27th
20,011
13 Apr 2040
54
28th
20,359
27 Mar 2041
55
29th
23,251
25 Feb 2049
63
30th
25,939
06 Jul 2056
71
31st
27,541
24 Nov 2060
75
32nd
29,191
01 Jun 2065
79
33rd
29,611
26 Jul 2066
81
34th
31,321
01 Apr 2071
85
35th
34,429
04 Oct 2079
94
36th
36,739
30 Jan 2086
100
37th
40,099
13 Apr 2095
109
38th
40,591
17 Aug 2096
111
39th
42,589
06 Feb 2102
116