Every Day Counts
Centred Triangular Prime Days
 
Age: 31,339 days
Date of birth
Your 35th Centred Triangular Prime Day is on
Sunday
when you will be
34,429 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
31 Mar 2025
31,357
18
85
03 Sep 2025
31,513
174
86
30 Nov 2025
31,601
262
86
25 Oct 2030
33,391
2,052
91
03 Jan 2031
33,461
2,122
91
28 Aug 2033
34,429
3,090
94
29 Mar 2041
37,199
5,860
101
06 Mar 2047
39,367
8,028
107
05 Feb 2059
43,721
12,382
119
22 Mar 2061
44,497
13,158
121
04 Jul 2072
48,619
17,280
133
30 Oct 2118
65,537
34,198
179
13 Dec 2213
100,279
68,940
274
02 Jul 2237
108,881
77,542
298
03 Apr 2298
131,071
99,732
358
26 Jul 7756
2,124,679
2,093,340
5817
Ordinal
Day Age
Date
Age
1st
19
13 Jun 1939
0
2nd
31
25 Jun 1939
0
3rd
109
11 Sep 1939
0
4th
199
10 Dec 1939
0
5th
409
07 Jul 1940
1
6th
571
16 Dec 1940
1
7th
631
14 Feb 1941
1
8th
829
31 Aug 1941
2
9th
1,489
22 Jun 1943
4
10th
1,999
13 Nov 1944
5
11th
2,341
21 Oct 1945
6
12th
2,971
13 Jul 1947
8
13th
3,529
21 Jan 1949
9
14th
4,621
18 Jan 1952
12
15th
4,789
04 Jul 1952
13
16th
7,039
01 Sep 1958
19
17th
7,669
23 May 1960
20
18th
8,779
07 Jun 1963
24
19th
9,721
04 Jan 1966
26
20th
10,459
12 Jan 1968
28
21st
10,711
20 Sep 1968
29
22nd
13,681
07 Nov 1976
37
23rd
14,851
21 Jan 1980
40
24th
16,069
23 May 1983
43
25th
16,381
30 Mar 1984
44
26th
17,659
29 Sep 1987
48
27th
20,011
08 Mar 1994
54
28th
20,359
19 Feb 1995
55
29th
23,251
20 Jan 2003
63
30th
25,939
31 May 2010
71
31st
27,541
19 Oct 2014
75
32nd
29,191
26 Apr 2019
79
33rd
29,611
19 Jun 2020
81
34th
31,321
23 Feb 2025
85
35th
34,429
28 Aug 2033
94
1
36th
36,739
25 Dec 2039
100
37th
40,099
07 Mar 2049
109
38th
40,591
12 Jul 2050
111
39th
42,589
31 Dec 2055
116