Every Day Counts
Centred Triangular Prime Days
 
Age: 16,068 days
Date of birth
Your 24th Centred Triangular Prime Day is on
Friday
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
21 Aug 2026
16,069
tomorrow
43
21 Aug 2026
16,069
tomorrow
43
18 Oct 2026
16,127
59
44
09 Jun 2027
16,361
293
44
29 Jun 2027
16,381
313
44
29 Jun 2027
16,381
313
44
25 Mar 2028
16,651
583
45
03 Oct 2028
16,843
775
46
19 Jul 2030
17,497
1,429
47
02 Jun 2032
18,181
2,113
49
25 Sep 2035
19,391
3,323
53
24 Mar 2037
19,937
3,869
54
06 Feb 2061
28,657
12,589
78
07 May 2102
43,721
27,653
119
04 Oct 2115
48,619
32,551
133
28 Jan 2162
65,537
49,469
179
13 Mar 2257
100,279
84,211
274
03 Jul 2341
131,071
115,003
358
Ordinal
Day Age
Date
Age
1st
19
11 Sep 1982
0
2nd
31
23 Sep 1982
0
3rd
109
10 Dec 1982
0
4th
199
10 Mar 1983
0
5th
409
06 Oct 1983
1
6th
571
16 Mar 1984
1
7th
631
15 May 1984
1
8th
829
29 Nov 1984
2
9th
1,489
20 Sep 1986
4
10th
1,999
12 Feb 1988
5
11th
2,341
19 Jan 1989
6
12th
2,971
11 Oct 1990
8
13th
3,529
21 Apr 1992
9
14th
4,621
18 Apr 1995
12
15th
4,789
03 Oct 1995
13
16th
7,039
30 Nov 2001
19
17th
7,669
22 Aug 2003
20
18th
8,779
05 Sep 2006
24
19th
9,721
04 Apr 2009
26
20th
10,459
12 Apr 2011
28
21st
10,711
20 Dec 2011
29
22nd
13,681
06 Feb 2020
37
23rd
14,851
21 Apr 2023
40
24th
16,069
21 Aug 2026
43
1
25th
16,381
29 Jun 2027
44
26th
17,659
28 Dec 2030
48
27th
20,011
06 Jun 2037
54
28th
20,359
20 May 2038
55
29th
23,251
20 Apr 2046
63
30th
25,939
29 Aug 2053
71
31st
27,541
17 Jan 2058
75
32nd
29,191
25 Jul 2062
79
33rd
29,611
18 Sep 2063
81
34th
31,321
24 May 2068
85
35th
34,429
26 Nov 2076
94
36th
36,739
25 Mar 2083
100
37th
40,099
05 Jun 2092
109
38th
40,591
10 Oct 2093
111
39th
42,589
31 Mar 2099
116