Every Day Counts
Centred Triangular Prime Days
 
Age: 17,896 days
Date of birth
Your 27th Centred Triangular Prime Day is on
Wednesday
when you will be
20,011 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
25 Dec 2018
17,903
7
49
03 Mar 2019
17,971
75
49
29 Sep 2019
18,181
285
49
08 Feb 2020
18,313
417
50
07 Jun 2020
18,433
537
50
08 Jan 2022
19,013
1,117
52
21 Jan 2023
19,391
1,495
53
12 Mar 2023
19,441
1,545
53
20 Jul 2024
19,937
2,041
54
02 Oct 2024
20,011
2,115
54
04 Jun 2048
28,657
10,761
78
01 Sep 2089
43,721
25,825
119
30 Jan 2103
48,619
30,723
133
26 May 2149
65,537
47,641
179
09 Jul 2244
100,279
82,383
274
29 Oct 2328
131,071
113,175
358
20 Feb 7787
2,124,679
2,106,783
5817
Ordinal
Day Age
Date
Age
1st
19
07 Jan 1970
0
2nd
31
19 Jan 1970
0
3rd
109
07 Apr 1970
0
4th
199
06 Jul 1970
0
5th
409
01 Feb 1971
1
6th
571
13 Jul 1971
1
7th
631
11 Sep 1971
1
8th
829
27 Mar 1972
2
9th
1,489
16 Jan 1974
4
10th
1,999
10 Jun 1975
5
11th
2,341
17 May 1976
6
12th
2,971
06 Feb 1978
8
13th
3,529
18 Aug 1979
9
14th
4,621
14 Aug 1982
12
15th
4,789
29 Jan 1983
13
16th
7,039
28 Mar 1989
19
17th
7,669
18 Dec 1990
20
18th
8,779
01 Jan 1994
24
19th
9,721
31 Jul 1996
26
20th
10,459
08 Aug 1998
28
21st
10,711
17 Apr 1999
29
22nd
13,681
04 Jun 2007
37
23rd
14,851
17 Aug 2010
40
24th
16,069
17 Dec 2013
43
25th
16,381
25 Oct 2014
44
26th
17,659
25 Apr 2018
48
27th
20,011
02 Oct 2024
54
1
28th
20,359
15 Sep 2025
55
29th
23,251
16 Aug 2033
63
30th
25,939
25 Dec 2040
71
31st
27,541
15 May 2045
75
32nd
29,191
20 Nov 2049
79
33rd
29,611
14 Jan 2051
81
34th
31,321
20 Sep 2055
85
35th
34,429
24 Mar 2064
94
36th
36,739
21 Jul 2070
100
37th
40,099
02 Oct 2079
109
38th
40,591
05 Feb 2081
111
39th
42,589
27 Jul 2086
116