Every Day Counts
Centred Triangular Prime Days
 
Age: 14,860 days
Date of birth
Your 24th Centred Triangular Prime Day is on
Monday
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
09 Jul 2025
14,867
7
40
28 Sep 2026
15,313
453
41
25 Dec 2026
15,401
541
42
13 Feb 2027
15,451
591
42
23 Oct 2028
16,069
1,209
43
20 Dec 2028
16,127
1,267
44
28 May 2030
16,651
1,791
45
06 Dec 2030
16,843
1,983
46
20 Sep 2032
17,497
2,637
47
05 Aug 2034
18,181
3,321
49
27 Nov 2037
19,391
4,531
53
27 May 2039
19,937
5,077
54
11 Apr 2063
28,657
13,797
78
09 Jul 2104
43,721
28,861
119
06 Dec 2117
48,619
33,759
133
01 Apr 2164
65,537
50,677
179
16 May 2259
100,279
85,419
274
05 Sep 2343
131,071
116,211
358
Ordinal
Day Age
Date
Age
1st
19
13 Nov 1984
0
2nd
31
25 Nov 1984
0
3rd
109
11 Feb 1985
0
4th
199
12 May 1985
0
5th
409
08 Dec 1985
1
6th
571
19 May 1986
1
7th
631
18 Jul 1986
1
8th
829
01 Feb 1987
2
9th
1,489
22 Nov 1988
4
10th
1,999
16 Apr 1990
5
11th
2,341
24 Mar 1991
6
12th
2,971
13 Dec 1992
8
13th
3,529
24 Jun 1994
9
14th
4,621
20 Jun 1997
12
15th
4,789
05 Dec 1997
13
16th
7,039
02 Feb 2004
19
17th
7,669
24 Oct 2005
20
18th
8,779
07 Nov 2008
24
19th
9,721
07 Jun 2011
26
20th
10,459
14 Jun 2013
28
21st
10,711
21 Feb 2014
29
22nd
13,681
10 Apr 2022
37
23rd
14,851
23 Jun 2025
40
24th
16,069
23 Oct 2028
43
1
25th
16,381
31 Aug 2029
44
26th
17,659
01 Mar 2033
48
27th
20,011
09 Aug 2039
54
28th
20,359
22 Jul 2040
55
29th
23,251
22 Jun 2048
63
30th
25,939
01 Nov 2055
71
31st
27,541
21 Mar 2060
75
32nd
29,191
26 Sep 2064
79
33rd
29,611
20 Nov 2065
81
34th
31,321
27 Jul 2070
85
35th
34,429
29 Jan 2079
94
36th
36,739
27 May 2085
100
37th
40,099
08 Aug 2094
109
38th
40,591
13 Dec 2095
111
39th
42,589
03 Jun 2101
116