Every Day Counts
Centred Triangular Prime Days
 
Age: 16,062 days
Date of birth
Your 24th Centred Triangular Prime Day is on
Sunday
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
24 Nov 2025
16,063
tomorrow
43
30 Nov 2025
16,069
7
43
27 Jan 2026
16,127
65
44
18 Sep 2026
16,361
299
44
08 Oct 2026
16,381
319
44
08 Oct 2026
16,381
319
44
05 Jul 2027
16,651
589
45
13 Jan 2028
16,843
781
46
28 Oct 2029
17,497
1,435
47
12 Sep 2031
18,181
2,119
49
04 Jan 2035
19,391
3,329
53
03 Jul 2036
19,937
3,875
54
18 May 2060
28,657
12,595
78
16 Aug 2101
43,721
27,659
119
13 Jan 2115
48,619
32,557
133
09 May 2161
65,537
49,475
179
22 Jun 2256
100,279
84,217
274
12 Oct 2340
131,071
115,009
358
Ordinal
Day Age
Date
Age
1st
19
21 Dec 1981
0
2nd
31
02 Jan 1982
0
3rd
109
21 Mar 1982
0
4th
199
19 Jun 1982
0
5th
409
15 Jan 1983
1
6th
571
26 Jun 1983
1
7th
631
25 Aug 1983
1
8th
829
10 Mar 1984
2
9th
1,489
30 Dec 1985
4
10th
1,999
24 May 1987
5
11th
2,341
30 Apr 1988
6
12th
2,971
20 Jan 1990
8
13th
3,529
01 Aug 1991
9
14th
4,621
28 Jul 1994
12
15th
4,789
12 Jan 1995
13
16th
7,039
11 Mar 2001
19
17th
7,669
01 Dec 2002
20
18th
8,779
15 Dec 2005
24
19th
9,721
14 Jul 2008
26
20th
10,459
22 Jul 2010
28
21st
10,711
31 Mar 2011
29
22nd
13,681
18 May 2019
37
23rd
14,851
31 Jul 2022
40
24th
16,069
30 Nov 2025
43
1
25th
16,381
08 Oct 2026
44
26th
17,659
08 Apr 2030
48
27th
20,011
15 Sep 2036
54
28th
20,359
29 Aug 2037
55
29th
23,251
30 Jul 2045
63
30th
25,939
08 Dec 2052
71
31st
27,541
28 Apr 2057
75
32nd
29,191
03 Nov 2061
79
33rd
29,611
28 Dec 2062
81
34th
31,321
03 Sep 2067
85
35th
34,429
07 Mar 2076
94
36th
36,739
04 Jul 2082
100
37th
40,099
15 Sep 2091
109
38th
40,591
19 Jan 2093
111
39th
42,589
10 Jul 2098
116