Every Day Counts
Centred Triangular Prime Days
 
Age: 29,174 days
Date of birth
Your 32nd Centred Triangular Prime Day is on
Friday
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
08 Feb 2026
29,179
5
79
20 Feb 2026
29,191
17
79
30 Oct 2026
29,443
269
80
20 Aug 2028
30,103
929
82
21 Aug 2037
33,391
4,217
91
30 Oct 2037
33,461
4,287
91
24 Jan 2048
37,199
8,025
101
31 Dec 2053
39,367
10,193
107
02 Dec 2065
43,721
14,547
119
17 Jan 2068
44,497
15,323
121
01 May 2079
48,619
19,445
133
26 Aug 2125
65,537
36,363
179
09 Oct 2220
100,279
71,105
274
28 Apr 2244
108,881
79,707
298
29 Jan 2305
131,071
101,897
358
23 May 7763
2,124,679
2,095,505
5817
Ordinal
Day Age
Date
Age
1st
19
09 Apr 1946
0
2nd
31
21 Apr 1946
0
3rd
109
08 Jul 1946
0
4th
199
06 Oct 1946
0
5th
409
04 May 1947
1
6th
571
13 Oct 1947
1
7th
631
12 Dec 1947
1
8th
829
27 Jun 1948
2
9th
1,489
18 Apr 1950
4
10th
1,999
10 Sep 1951
5
11th
2,341
17 Aug 1952
6
12th
2,971
09 May 1954
8
13th
3,529
18 Nov 1955
9
14th
4,621
14 Nov 1958
12
15th
4,789
01 May 1959
13
16th
7,039
28 Jun 1965
19
17th
7,669
20 Mar 1967
20
18th
8,779
03 Apr 1970
24
19th
9,721
31 Oct 1972
26
20th
10,459
08 Nov 1974
28
21st
10,711
18 Jul 1975
29
22nd
13,681
04 Sep 1983
37
23rd
14,851
17 Nov 1986
40
24th
16,069
19 Mar 1990
43
25th
16,381
25 Jan 1991
44
26th
17,659
26 Jul 1994
48
27th
20,011
02 Jan 2001
54
28th
20,359
16 Dec 2001
55
29th
23,251
16 Nov 2009
63
30th
25,939
27 Mar 2017
71
31st
27,541
15 Aug 2021
75
32nd
29,191
20 Feb 2026
79
1
33rd
29,611
16 Apr 2027
81
34th
31,321
21 Dec 2031
85
35th
34,429
24 Jun 2040
94
36th
36,739
21 Oct 2046
100
37th
40,099
02 Jan 2056
109
38th
40,591
08 May 2057
111
39th
42,589
27 Oct 2062
116