Every Day Counts
Centred Triangular Prime Days
 
Age: 29,174 days
Date of birth
Your 32nd Centred Triangular Prime Day is on
Saturday
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
04 May 2026
29,179
5
79
16 May 2026
29,191
17
79
23 Jan 2027
29,443
269
80
13 Nov 2028
30,103
929
82
14 Nov 2037
33,391
4,217
91
23 Jan 2038
33,461
4,287
91
18 Apr 2048
37,199
8,025
101
26 Mar 2054
39,367
10,193
107
25 Feb 2066
43,721
14,547
119
11 Apr 2068
44,497
15,323
121
25 Jul 2079
48,619
19,445
133
19 Nov 2125
65,537
36,363
179
02 Jan 2221
100,279
71,105
274
22 Jul 2244
108,881
79,707
298
24 Apr 2305
131,071
101,897
358
16 Aug 7763
2,124,679
2,095,505
5817
Ordinal
Day Age
Date
Age
1st
19
03 Jul 1946
0
2nd
31
15 Jul 1946
0
3rd
109
01 Oct 1946
0
4th
199
30 Dec 1946
0
5th
409
28 Jul 1947
1
6th
571
06 Jan 1948
1
7th
631
06 Mar 1948
1
8th
829
20 Sep 1948
2
9th
1,489
12 Jul 1950
4
10th
1,999
04 Dec 1951
5
11th
2,341
10 Nov 1952
6
12th
2,971
02 Aug 1954
8
13th
3,529
11 Feb 1956
9
14th
4,621
07 Feb 1959
12
15th
4,789
25 Jul 1959
13
16th
7,039
21 Sep 1965
19
17th
7,669
13 Jun 1967
20
18th
8,779
27 Jun 1970
24
19th
9,721
24 Jan 1973
26
20th
10,459
01 Feb 1975
28
21st
10,711
11 Oct 1975
29
22nd
13,681
28 Nov 1983
37
23rd
14,851
10 Feb 1987
40
24th
16,069
12 Jun 1990
43
25th
16,381
20 Apr 1991
44
26th
17,659
19 Oct 1994
48
27th
20,011
28 Mar 2001
54
28th
20,359
11 Mar 2002
55
29th
23,251
09 Feb 2010
63
30th
25,939
20 Jun 2017
71
31st
27,541
08 Nov 2021
75
32nd
29,191
16 May 2026
79
1
33rd
29,611
10 Jul 2027
81
34th
31,321
15 Mar 2032
85
35th
34,429
17 Sep 2040
94
36th
36,739
14 Jan 2047
100
37th
40,099
27 Mar 2056
109
38th
40,591
01 Aug 2057
111
39th
42,589
20 Jan 2063
116