Every Day Counts
Centred Triangular Prime Days
 
Age: 25,940 days
Date of birth
Your 31st Centred Triangular Prime Day is on
Monday
when you will be
27,541 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
26 Oct 2019
25,943
3
71
05 Aug 2020
26,227
287
71
24 Jan 2021
26,399
459
72
02 Nov 2021
26,681
741
73
11 Mar 2024
27,541
1,601
75
01 Apr 2027
28,657
2,717
78
17 Mar 2031
30,103
4,163
82
20 Aug 2050
37,199
11,259
101
27 Jul 2056
39,367
13,427
107
28 Jun 2068
43,721
17,781
119
13 Aug 2070
44,497
18,557
121
25 Nov 2081
48,619
22,679
133
22 Mar 2128
65,537
39,597
179
06 May 2223
100,279
74,339
274
23 Nov 2246
108,881
82,941
298
26 Aug 2307
131,071
105,131
358
17 Dec 7765
2,124,679
2,098,739
5817
Ordinal
Day Age
Date
Age
1st
19
03 Nov 1948
0
2nd
31
15 Nov 1948
0
3rd
109
01 Feb 1949
0
4th
199
02 May 1949
0
5th
409
28 Nov 1949
1
6th
571
09 May 1950
1
7th
631
08 Jul 1950
1
8th
829
22 Jan 1951
2
9th
1,489
12 Nov 1952
4
10th
1,999
06 Apr 1954
5
11th
2,341
14 Mar 1955
6
12th
2,971
03 Dec 1956
8
13th
3,529
14 Jun 1958
9
14th
4,621
10 Jun 1961
12
15th
4,789
25 Nov 1961
13
16th
7,039
23 Jan 1968
19
17th
7,669
14 Oct 1969
20
18th
8,779
28 Oct 1972
24
19th
9,721
28 May 1975
26
20th
10,459
04 Jun 1977
28
21st
10,711
11 Feb 1978
29
22nd
13,681
31 Mar 1986
37
23rd
14,851
13 Jun 1989
40
24th
16,069
13 Oct 1992
43
25th
16,381
21 Aug 1993
44
26th
17,659
19 Feb 1997
48
27th
20,011
30 Jul 2003
54
28th
20,359
12 Jul 2004
55
29th
23,251
12 Jun 2012
63
30th
25,939
22 Oct 2019
71
31st
27,541
11 Mar 2024
75
1
32nd
29,191
16 Sep 2028
79
33rd
29,611
10 Nov 2029
81
34th
31,321
17 Jul 2034
85
35th
34,429
19 Jan 2043
94
36th
36,739
17 May 2049
100
37th
40,099
29 Jul 2058
109
38th
40,591
03 Dec 2059
111
39th
42,589
23 May 2065
116