Every Day Counts
Centred Triangular Prime Days
 
Age: 17,663 days
Date of birth
Your 27th Centred Triangular Prime Day is on
Saturday
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
03 Dec 2024
17,669
6
48
01 Oct 2025
17,971
308
49
29 Apr 2026
18,181
518
49
08 Sep 2026
18,313
650
50
06 Jan 2027
18,433
770
50
08 Aug 2028
19,013
1,350
52
21 Aug 2029
19,391
1,728
53
10 Oct 2029
19,441
1,778
53
18 Feb 2031
19,937
2,274
54
03 May 2031
20,011
2,348
54
03 Jan 2055
28,657
10,994
78
01 Apr 2096
43,721
26,058
119
30 Aug 2109
48,619
30,956
133
25 Dec 2155
65,537
47,874
179
07 Feb 2251
100,279
82,616
274
30 May 2335
131,071
113,408
358
20 Sep 7793
2,124,679
2,107,016
5817
Ordinal
Day Age
Date
Age
1st
19
07 Aug 1976
0
2nd
31
19 Aug 1976
0
3rd
109
05 Nov 1976
0
4th
199
03 Feb 1977
0
5th
409
01 Sep 1977
1
6th
571
10 Feb 1978
1
7th
631
11 Apr 1978
1
8th
829
26 Oct 1978
2
9th
1,489
16 Aug 1980
4
10th
1,999
08 Jan 1982
5
11th
2,341
16 Dec 1982
6
12th
2,971
06 Sep 1984
8
13th
3,529
18 Mar 1986
9
14th
4,621
14 Mar 1989
12
15th
4,789
29 Aug 1989
13
16th
7,039
27 Oct 1995
19
17th
7,669
18 Jul 1997
20
18th
8,779
01 Aug 2000
24
19th
9,721
01 Mar 2003
26
20th
10,459
08 Mar 2005
28
21st
10,711
15 Nov 2005
29
22nd
13,681
02 Jan 2014
37
23rd
14,851
17 Mar 2017
40
24th
16,069
17 Jul 2020
43
25th
16,381
25 May 2021
44
26th
17,659
23 Nov 2024
48
27th
20,011
03 May 2031
54
1
28th
20,359
15 Apr 2032
55
29th
23,251
16 Mar 2040
63
30th
25,939
26 Jul 2047
71
31st
27,541
14 Dec 2051
75
32nd
29,191
20 Jun 2056
79
33rd
29,611
14 Aug 2057
81
34th
31,321
20 Apr 2062
85
35th
34,429
23 Oct 2070
94
36th
36,739
18 Feb 2077
100
37th
40,099
02 May 2086
109
38th
40,591
06 Sep 2087
111
39th
42,589
24 Feb 2093
116