Every Day Counts
Centred Triangular Prime Days
 
Age: 29,173 days
Date of birth
Your 32nd Centred Triangular Prime Day is on
Thursday
when you will be
29,191 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 2026
29,173
today
79
02 Apr 2026
29,191
18
79
10 Dec 2026
29,443
270
80
30 Sep 2028
30,103
930
82
01 Oct 2037
33,391
4,218
91
10 Dec 2037
33,461
4,288
91
05 Mar 2048
37,199
8,026
101
10 Feb 2054
39,367
10,194
107
12 Jan 2066
43,721
14,548
119
27 Feb 2068
44,497
15,324
121
11 Jun 2079
48,619
19,446
133
06 Oct 2125
65,537
36,364
179
19 Nov 2220
100,279
71,106
274
08 Jun 2244
108,881
79,708
298
11 Mar 2305
131,071
101,898
358
03 Jul 7763
2,124,679
2,095,506
5817
Ordinal
Day Age
Date
Age
1st
19
20 May 1946
0
2nd
31
01 Jun 1946
0
3rd
109
18 Aug 1946
0
4th
199
16 Nov 1946
0
5th
409
14 Jun 1947
1
6th
571
23 Nov 1947
1
7th
631
22 Jan 1948
1
8th
829
07 Aug 1948
2
9th
1,489
29 May 1950
4
10th
1,999
21 Oct 1951
5
11th
2,341
27 Sep 1952
6
12th
2,971
19 Jun 1954
8
13th
3,529
29 Dec 1955
9
14th
4,621
25 Dec 1958
12
15th
4,789
11 Jun 1959
13
16th
7,039
08 Aug 1965
19
17th
7,669
30 Apr 1967
20
18th
8,779
14 May 1970
24
19th
9,721
11 Dec 1972
26
20th
10,459
19 Dec 1974
28
21st
10,711
28 Aug 1975
29
22nd
13,681
15 Oct 1983
37
23rd
14,851
28 Dec 1986
40
24th
16,069
29 Apr 1990
43
25th
16,381
07 Mar 1991
44
26th
17,659
05 Sep 1994
48
27th
20,011
12 Feb 2001
54
28th
20,359
26 Jan 2002
55
29th
23,251
27 Dec 2009
63
30th
25,939
07 May 2017
71
31st
27,541
25 Sep 2021
75
32nd
29,191
02 Apr 2026
79
1
33rd
29,611
27 May 2027
81
34th
31,321
31 Jan 2032
85
35th
34,429
04 Aug 2040
94
36th
36,739
01 Dec 2046
100
37th
40,099
12 Feb 2056
109
38th
40,591
18 Jun 2057
111
39th
42,589
07 Dec 2062
116