Every Day Counts
Centred Triangular Prime Days
 
Age: 29,195 days
Date of birth
Your 33rd Centred Triangular Prime Day is on
Friday
when you will be
29,611 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
07 Jul 2025
29,201
6
79
06 Mar 2026
29,443
248
80
21 Aug 2026
29,611
416
81
26 Dec 2027
30,103
908
82
26 Dec 2036
33,391
4,196
91
06 Mar 2037
33,461
4,266
91
31 May 2047
37,199
8,004
101
07 May 2053
39,367
10,172
107
08 Apr 2065
43,721
14,526
119
24 May 2067
44,497
15,302
121
05 Sep 2078
48,619
19,424
133
31 Dec 2124
65,537
36,342
179
14 Feb 2220
100,279
71,084
274
03 Sep 2243
108,881
79,686
298
05 Jun 2304
131,071
101,876
358
27 Sep 7762
2,124,679
2,095,484
5817
Ordinal
Day Age
Date
Age
1st
19
14 Aug 1945
0
2nd
31
26 Aug 1945
0
3rd
109
12 Nov 1945
0
4th
199
10 Feb 1946
0
5th
409
08 Sep 1946
1
6th
571
17 Feb 1947
1
7th
631
18 Apr 1947
1
8th
829
02 Nov 1947
2
9th
1,489
23 Aug 1949
4
10th
1,999
15 Jan 1951
5
11th
2,341
23 Dec 1951
6
12th
2,971
13 Sep 1953
8
13th
3,529
25 Mar 1955
9
14th
4,621
21 Mar 1958
12
15th
4,789
05 Sep 1958
13
16th
7,039
02 Nov 1964
19
17th
7,669
25 Jul 1966
20
18th
8,779
08 Aug 1969
24
19th
9,721
07 Mar 1972
26
20th
10,459
15 Mar 1974
28
21st
10,711
22 Nov 1974
29
22nd
13,681
09 Jan 1983
37
23rd
14,851
24 Mar 1986
40
24th
16,069
24 Jul 1989
43
25th
16,381
01 Jun 1990
44
26th
17,659
30 Nov 1993
48
27th
20,011
09 May 2000
54
28th
20,359
22 Apr 2001
55
29th
23,251
23 Mar 2009
63
30th
25,939
01 Aug 2016
71
31st
27,541
20 Dec 2020
75
32nd
29,191
27 Jun 2025
79
33rd
29,611
21 Aug 2026
81
1
34th
31,321
27 Apr 2031
85
35th
34,429
30 Oct 2039
94
36th
36,739
25 Feb 2046
100
37th
40,099
09 May 2055
109
38th
40,591
12 Sep 2056
111
39th
42,589
03 Mar 2062
116