Every Day Counts
Centred Triangular Prime Days
 
Age: 29,734 days
Date of birth
Your 34th Centred Triangular Prime Day is on
Monday
when you will be
31,321 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
22 Jan 2025
29,741
7
81
19 Jan 2026
30,103
369
82
20 Apr 2027
30,559
825
83
21 May 2029
31,321
1,587
85
20 Jan 2035
33,391
3,657
91
31 Mar 2035
33,461
3,727
91
24 Jun 2045
37,199
7,465
101
01 Jun 2051
39,367
9,633
107
03 May 2063
43,721
13,987
119
17 Jun 2065
44,497
14,763
121
29 Sep 2076
48,619
18,885
133
25 Jan 2123
65,537
35,803
179
10 Mar 2218
100,279
70,545
274
27 Sep 2241
108,881
79,147
298
30 Jun 2302
131,071
101,337
358
21 Oct 7760
2,124,679
2,094,945
5817
Ordinal
Day Age
Date
Age
1st
19
08 Sep 1943
0
2nd
31
20 Sep 1943
0
3rd
109
07 Dec 1943
0
4th
199
06 Mar 1944
0
5th
409
02 Oct 1944
1
6th
571
13 Mar 1945
1
7th
631
12 May 1945
1
8th
829
26 Nov 1945
2
9th
1,489
17 Sep 1947
4
10th
1,999
08 Feb 1949
5
11th
2,341
16 Jan 1950
6
12th
2,971
08 Oct 1951
8
13th
3,529
18 Apr 1953
9
14th
4,621
14 Apr 1956
12
15th
4,789
29 Sep 1956
13
16th
7,039
27 Nov 1962
19
17th
7,669
18 Aug 1964
20
18th
8,779
02 Sep 1967
24
19th
9,721
01 Apr 1970
26
20th
10,459
08 Apr 1972
28
21st
10,711
16 Dec 1972
29
22nd
13,681
02 Feb 1981
37
23rd
14,851
17 Apr 1984
40
24th
16,069
18 Aug 1987
43
25th
16,381
25 Jun 1988
44
26th
17,659
25 Dec 1991
48
27th
20,011
03 Jun 1998
54
28th
20,359
17 May 1999
55
29th
23,251
17 Apr 2007
63
30th
25,939
26 Aug 2014
71
31st
27,541
14 Jan 2019
75
32nd
29,191
22 Jul 2023
79
33rd
29,611
14 Sep 2024
81
34th
31,321
21 May 2029
85
1
35th
34,429
23 Nov 2037
94
36th
36,739
21 Mar 2044
100
37th
40,099
02 Jun 2053
109
38th
40,591
07 Oct 2054
111
39th
42,589
27 Mar 2060
116