Every Day Counts
Centred Triangular Prime Days
 
Age: 14,851 days
Date of birth

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
10 Jan 2025
14,851
today
40
10 Jan 2025
14,851
today
40
17 Apr 2026
15,313
462
41
14 Jul 2026
15,401
550
42
02 Sep 2026
15,451
600
42
09 Jul 2028
16,127
1,276
44
15 Dec 2029
16,651
1,800
45
25 Jun 2030
16,843
1,992
46
09 Apr 2032
17,497
2,646
47
22 Feb 2034
18,181
3,330
49
16 Jun 2037
19,391
4,540
53
14 Dec 2038
19,937
5,086
54
29 Oct 2062
28,657
13,806
78
27 Jan 2104
43,721
28,870
119
25 Jun 2117
48,619
33,768
133
20 Oct 2163
65,537
50,686
179
03 Dec 2258
100,279
85,428
274
25 Mar 2343
131,071
116,220
358
Ordinal
Day Age
Date
Age
1st
19
02 Jun 1984
0
2nd
31
14 Jun 1984
0
3rd
109
31 Aug 1984
0
4th
199
29 Nov 1984
0
5th
409
27 Jun 1985
1
6th
571
06 Dec 1985
1
7th
631
04 Feb 1986
1
8th
829
21 Aug 1986
2
9th
1,489
11 Jun 1988
4
10th
1,999
03 Nov 1989
5
11th
2,341
11 Oct 1990
6
12th
2,971
02 Jul 1992
8
13th
3,529
11 Jan 1994
9
14th
4,621
07 Jan 1997
12
15th
4,789
24 Jun 1997
13
16th
7,039
22 Aug 2003
19
17th
7,669
13 May 2005
20
18th
8,779
27 May 2008
24
19th
9,721
25 Dec 2010
26
20th
10,459
01 Jan 2013
28
21st
10,711
10 Sep 2013
29
22nd
13,681
28 Oct 2021
37
23rd
14,851
10 Jan 2025
40
1
24th
16,069
12 May 2028
43
25th
16,381
20 Mar 2029
44
26th
17,659
18 Sep 2032
48
27th
20,011
26 Feb 2039
54
28th
20,359
09 Feb 2040
55
29th
23,251
10 Jan 2048
63
30th
25,939
21 May 2055
71
31st
27,541
09 Oct 2059
75
32nd
29,191
15 Apr 2064
79
33rd
29,611
09 Jun 2065
81
34th
31,321
13 Feb 2070
85
35th
34,429
18 Aug 2078
94
36th
36,739
14 Dec 2084
100
37th
40,099
25 Feb 2094
109
38th
40,591
02 Jul 2095
111
39th
42,589
21 Dec 2100
116