Every Day Counts
Centred Triangular Prime Days
 
Age: 20,003 days
Date of birth
Your 27th Centred Triangular Prime Day is on
Thursday
when you will be
20,011 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
19 Mar 2026
20,011
8
54
19 Mar 2026
20,011
8
54
25 Sep 2026
20,201
198
55
28 Feb 2027
20,357
354
55
03 Nov 2030
21,701
1,698
59
18 Nov 2032
22,447
2,444
61
19 Nov 2049
28,657
8,654
78
04 Nov 2053
30,103
10,100
82
09 Apr 2073
37,199
17,196
101
17 Mar 2079
39,367
19,364
107
16 Feb 2091
43,721
23,718
119
16 Jul 2104
48,619
28,616
133
10 Nov 2150
65,537
45,534
179
24 Dec 2245
100,279
80,276
274
13 Jul 2269
108,881
88,878
298
15 Apr 2330
131,071
111,068
358
06 Aug 7788
2,124,679
2,104,676
5817
Ordinal
Day Age
Date
Age
1st
19
24 Jun 1971
0
2nd
31
06 Jul 1971
0
3rd
109
22 Sep 1971
0
4th
199
21 Dec 1971
0
5th
409
18 Jul 1972
1
6th
571
27 Dec 1972
1
7th
631
25 Feb 1973
1
8th
829
11 Sep 1973
2
9th
1,489
03 Jul 1975
4
10th
1,999
24 Nov 1976
5
11th
2,341
01 Nov 1977
6
12th
2,971
24 Jul 1979
8
13th
3,529
01 Feb 1981
9
14th
4,621
29 Jan 1984
12
15th
4,789
15 Jul 1984
13
16th
7,039
12 Sep 1990
19
17th
7,669
03 Jun 1992
20
18th
8,779
18 Jun 1995
24
19th
9,721
15 Jan 1998
26
20th
10,459
23 Jan 2000
28
21st
10,711
01 Oct 2000
29
22nd
13,681
18 Nov 2008
37
23rd
14,851
01 Feb 2012
40
24th
16,069
03 Jun 2015
43
25th
16,381
10 Apr 2016
44
26th
17,659
10 Oct 2019
48
27th
20,011
19 Mar 2026
54
1
28th
20,359
02 Mar 2027
55
29th
23,251
31 Jan 2035
63
30th
25,939
11 Jun 2042
71
31st
27,541
30 Oct 2046
75
32nd
29,191
07 May 2051
79
33rd
29,611
30 Jun 2052
81
34th
31,321
06 Mar 2057
85
35th
34,429
08 Sep 2065
94
36th
36,739
05 Jan 2072
100
37th
40,099
18 Mar 2081
109
38th
40,591
23 Jul 2082
111
39th
42,589
11 Jan 2088
116