Every Day Counts
Centred Triangular Prime Days
 
Age: 25,937 days
Date of birth
Your 30th Centred Triangular Prime Day is on
Friday
when you will be
25,939 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
28 Jun 2024
25,939
2
71
28 Jun 2024
25,939
2
71
12 Apr 2025
26,227
290
71
01 Oct 2025
26,399
462
72
10 Jul 2026
26,681
744
73
07 Dec 2031
28,657
2,720
78
22 Nov 2035
30,103
4,166
82
27 Apr 2055
37,199
11,262
101
03 Apr 2061
39,367
13,430
107
05 Mar 2073
43,721
17,784
119
20 Apr 2075
44,497
18,560
121
02 Aug 2086
48,619
22,682
133
27 Nov 2132
65,537
39,600
179
11 Jan 2228
100,279
74,342
274
31 Jul 2251
108,881
82,944
298
02 May 2312
131,071
105,134
358
24 Aug 7770
2,124,679
2,098,742
5817
Ordinal
Day Age
Date
Age
1st
19
11 Jul 1953
0
2nd
31
23 Jul 1953
0
3rd
109
09 Oct 1953
0
4th
199
07 Jan 1954
0
5th
409
05 Aug 1954
1
6th
571
14 Jan 1955
1
7th
631
15 Mar 1955
1
8th
829
29 Sep 1955
2
9th
1,489
20 Jul 1957
4
10th
1,999
12 Dec 1958
5
11th
2,341
19 Nov 1959
6
12th
2,971
10 Aug 1961
8
13th
3,529
19 Feb 1963
9
14th
4,621
15 Feb 1966
12
15th
4,789
02 Aug 1966
13
16th
7,039
29 Sep 1972
19
17th
7,669
21 Jun 1974
20
18th
8,779
05 Jul 1977
24
19th
9,721
02 Feb 1980
26
20th
10,459
09 Feb 1982
28
21st
10,711
19 Oct 1982
29
22nd
13,681
06 Dec 1990
37
23rd
14,851
18 Feb 1994
40
24th
16,069
20 Jun 1997
43
25th
16,381
28 Apr 1998
44
26th
17,659
27 Oct 2001
48
27th
20,011
05 Apr 2008
54
28th
20,359
19 Mar 2009
55
29th
23,251
17 Feb 2017
63
30th
25,939
28 Jun 2024
71
1
31st
27,541
16 Nov 2028
75
32nd
29,191
24 May 2033
79
33rd
29,611
18 Jul 2034
81
34th
31,321
24 Mar 2039
85
35th
34,429
26 Sep 2047
94
36th
36,739
22 Jan 2054
100
37th
40,099
05 Apr 2063
109
38th
40,591
09 Aug 2064
111
39th
42,589
28 Jan 2070
116