Every Day Counts
Centred Triangular Prime Days
 
Age: 14,833 days
Date of birth
Your 23rd Centred Triangular Prime Day is on
Tuesday
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
16 Nov 2026
14,843
10
40
24 Nov 2026
14,851
18
40
29 Feb 2028
15,313
480
41
27 May 2028
15,401
568
42
16 Jul 2028
15,451
618
42
23 May 2030
16,127
1,294
44
29 Oct 2031
16,651
1,818
45
08 May 2032
16,843
2,010
46
21 Feb 2034
17,497
2,664
47
06 Jan 2036
18,181
3,348
49
30 Apr 2039
19,391
4,558
53
27 Oct 2040
19,937
5,104
54
11 Sep 2064
28,657
13,824
78
10 Dec 2105
43,721
28,888
119
09 May 2119
48,619
33,786
133
02 Sep 2165
65,537
50,704
179
16 Oct 2260
100,279
85,446
274
05 Feb 2345
131,071
116,238
358
Ordinal
Day Age
Date
Age
1st
19
16 Apr 1986
0
2nd
31
28 Apr 1986
0
3rd
109
15 Jul 1986
0
4th
199
13 Oct 1986
0
5th
409
11 May 1987
1
6th
571
20 Oct 1987
1
7th
631
19 Dec 1987
1
8th
829
04 Jul 1988
2
9th
1,489
25 Apr 1990
4
10th
1,999
17 Sep 1991
5
11th
2,341
24 Aug 1992
6
12th
2,971
16 May 1994
8
13th
3,529
25 Nov 1995
9
14th
4,621
21 Nov 1998
12
15th
4,789
08 May 1999
13
16th
7,039
05 Jul 2005
19
17th
7,669
27 Mar 2007
20
18th
8,779
10 Apr 2010
24
19th
9,721
07 Nov 2012
26
20th
10,459
15 Nov 2014
28
21st
10,711
25 Jul 2015
29
22nd
13,681
11 Sep 2023
37
23rd
14,851
24 Nov 2026
40
1
24th
16,069
26 Mar 2030
43
25th
16,381
01 Feb 2031
44
26th
17,659
02 Aug 2034
48
27th
20,011
09 Jan 2041
54
28th
20,359
23 Dec 2041
55
29th
23,251
23 Nov 2049
63
30th
25,939
03 Apr 2057
71
31st
27,541
22 Aug 2061
75
32nd
29,191
27 Feb 2066
79
33rd
29,611
23 Apr 2067
81
34th
31,321
28 Dec 2071
85
35th
34,429
01 Jul 2080
94
36th
36,739
28 Oct 2086
100
37th
40,099
09 Jan 2096
109
38th
40,591
15 May 2097
111
39th
42,589
04 Nov 2102
116