Every Day Counts
Centred Triangular Prime Days
 
Age: 29,595 days
Date of birth
Your 33rd Centred Triangular Prime Day is on
Monday
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
22 Jan 2025
29,599
4
81
03 Feb 2025
29,611
16
81
10 Jun 2026
30,103
508
82
09 Sep 2027
30,559
964
83
11 Jun 2035
33,391
3,796
91
20 Aug 2035
33,461
3,866
91
13 Nov 2045
37,199
7,604
101
21 Oct 2051
39,367
9,772
107
22 Sep 2063
43,721
14,126
119
06 Nov 2065
44,497
14,902
121
18 Feb 2077
48,619
19,024
133
16 Jun 2123
65,537
35,942
179
30 Jul 2218
100,279
70,684
274
16 Feb 2242
108,881
79,286
298
19 Nov 2302
131,071
101,476
358
12 Mar 7761
2,124,679
2,095,084
5817
Ordinal
Day Age
Date
Age
1st
19
28 Jan 1944
0
2nd
31
09 Feb 1944
0
3rd
109
27 Apr 1944
0
4th
199
26 Jul 1944
0
5th
409
21 Feb 1945
1
6th
571
02 Aug 1945
1
7th
631
01 Oct 1945
1
8th
829
17 Apr 1946
2
9th
1,489
06 Feb 1948
4
10th
1,999
30 Jun 1949
5
11th
2,341
07 Jun 1950
6
12th
2,971
27 Feb 1952
8
13th
3,529
07 Sep 1953
9
14th
4,621
03 Sep 1956
12
15th
4,789
18 Feb 1957
13
16th
7,039
18 Apr 1963
19
17th
7,669
07 Jan 1965
20
18th
8,779
22 Jan 1968
24
19th
9,721
21 Aug 1970
26
20th
10,459
28 Aug 1972
28
21st
10,711
07 May 1973
29
22nd
13,681
24 Jun 1981
37
23rd
14,851
06 Sep 1984
40
24th
16,069
07 Jan 1988
43
25th
16,381
14 Nov 1988
44
26th
17,659
15 May 1992
48
27th
20,011
23 Oct 1998
54
28th
20,359
06 Oct 1999
55
29th
23,251
06 Sep 2007
63
30th
25,939
15 Jan 2015
71
31st
27,541
05 Jun 2019
75
32nd
29,191
11 Dec 2023
79
33rd
29,611
03 Feb 2025
81
1
34th
31,321
10 Oct 2029
85
35th
34,429
14 Apr 2038
94
36th
36,739
10 Aug 2044
100
37th
40,099
22 Oct 2053
109
38th
40,591
26 Feb 2055
111
39th
42,589
16 Aug 2060
116