Every Day Counts
Centred Triangular Prime Days
 
Age: 29,598 days
Date of birth
Your 33rd Centred Triangular Prime Day is on
Thursday
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
15 Mar 2025
29,599
tomorrow
81
27 Mar 2025
29,611
13
81
01 Aug 2026
30,103
505
82
31 Oct 2027
30,559
961
83
02 Aug 2035
33,391
3,793
91
11 Oct 2035
33,461
3,863
91
04 Jan 2046
37,199
7,601
101
12 Dec 2051
39,367
9,769
107
13 Nov 2063
43,721
14,123
119
28 Dec 2065
44,497
14,899
121
11 Apr 2077
48,619
19,021
133
07 Aug 2123
65,537
35,939
179
20 Sep 2218
100,279
70,681
274
09 Apr 2242
108,881
79,283
298
10 Jan 2303
131,071
101,473
358
03 May 7761
2,124,679
2,095,081
5817
Ordinal
Day Age
Date
Age
1st
19
20 Mar 1944
0
2nd
31
01 Apr 1944
0
3rd
109
18 Jun 1944
0
4th
199
16 Sep 1944
0
5th
409
14 Apr 1945
1
6th
571
23 Sep 1945
1
7th
631
22 Nov 1945
1
8th
829
08 Jun 1946
2
9th
1,489
29 Mar 1948
4
10th
1,999
21 Aug 1949
5
11th
2,341
29 Jul 1950
6
12th
2,971
19 Apr 1952
8
13th
3,529
29 Oct 1953
9
14th
4,621
25 Oct 1956
12
15th
4,789
11 Apr 1957
13
16th
7,039
09 Jun 1963
19
17th
7,669
28 Feb 1965
20
18th
8,779
14 Mar 1968
24
19th
9,721
12 Oct 1970
26
20th
10,459
19 Oct 1972
28
21st
10,711
28 Jun 1973
29
22nd
13,681
15 Aug 1981
37
23rd
14,851
28 Oct 1984
40
24th
16,069
28 Feb 1988
43
25th
16,381
05 Jan 1989
44
26th
17,659
06 Jul 1992
48
27th
20,011
14 Dec 1998
54
28th
20,359
27 Nov 1999
55
29th
23,251
28 Oct 2007
63
30th
25,939
08 Mar 2015
71
31st
27,541
27 Jul 2019
75
32nd
29,191
01 Feb 2024
79
33rd
29,611
27 Mar 2025
81
1
34th
31,321
01 Dec 2029
85
35th
34,429
05 Jun 2038
94
36th
36,739
01 Oct 2044
100
37th
40,099
13 Dec 2053
109
38th
40,591
19 Apr 2055
111
39th
42,589
07 Oct 2060
116