Every Day Counts
Centred Triangular Prime Days
 
Age: 29,203 days
Date of birth
Your 33rd Centred Triangular Prime Day is on
Saturday
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
17 Mar 2025
29,207
4
79
08 Nov 2025
29,443
240
80
25 Apr 2026
29,611
408
81
30 Aug 2027
30,103
900
82
30 Aug 2036
33,391
4,188
91
08 Nov 2036
33,461
4,258
91
02 Feb 2047
37,199
7,996
101
09 Jan 2053
39,367
10,164
107
11 Dec 2064
43,721
14,518
119
26 Jan 2067
44,497
15,294
121
10 May 2078
48,619
19,416
133
04 Sep 2124
65,537
36,334
179
19 Oct 2219
100,279
71,076
274
08 May 2243
108,881
79,678
298
08 Feb 2304
131,071
101,868
358
01 Jun 7762
2,124,679
2,095,476
5817
Ordinal
Day Age
Date
Age
1st
19
18 Apr 1945
0
2nd
31
30 Apr 1945
0
3rd
109
17 Jul 1945
0
4th
199
15 Oct 1945
0
5th
409
13 May 1946
1
6th
571
22 Oct 1946
1
7th
631
21 Dec 1946
1
8th
829
07 Jul 1947
2
9th
1,489
27 Apr 1949
4
10th
1,999
19 Sep 1950
5
11th
2,341
27 Aug 1951
6
12th
2,971
18 May 1953
8
13th
3,529
27 Nov 1954
9
14th
4,621
23 Nov 1957
12
15th
4,789
10 May 1958
13
16th
7,039
07 Jul 1964
19
17th
7,669
29 Mar 1966
20
18th
8,779
12 Apr 1969
24
19th
9,721
10 Nov 1971
26
20th
10,459
17 Nov 1973
28
21st
10,711
27 Jul 1974
29
22nd
13,681
13 Sep 1982
37
23rd
14,851
26 Nov 1985
40
24th
16,069
28 Mar 1989
43
25th
16,381
03 Feb 1990
44
26th
17,659
04 Aug 1993
48
27th
20,011
12 Jan 2000
54
28th
20,359
25 Dec 2000
55
29th
23,251
25 Nov 2008
63
30th
25,939
05 Apr 2016
71
31st
27,541
24 Aug 2020
75
32nd
29,191
01 Mar 2025
79
33rd
29,611
25 Apr 2026
81
1
34th
31,321
30 Dec 2030
85
35th
34,429
04 Jul 2039
94
36th
36,739
30 Oct 2045
100
37th
40,099
11 Jan 2055
109
38th
40,591
17 May 2056
111
39th
42,589
05 Nov 2061
116