Every Day Counts
Centred Triangular Prime Days
 
Age: 20,001 days
Date of birth
Your 27th Centred Triangular Prime Day is on
Wednesday
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
18 Nov 2026
20,011
10
54
18 Nov 2026
20,011
10
54
27 May 2027
20,201
200
55
30 Oct 2027
20,357
356
55
05 Jul 2031
21,701
1,700
59
20 Jul 2033
22,447
2,446
61
21 Jul 2050
28,657
8,656
78
06 Jul 2054
30,103
10,102
82
09 Dec 2073
37,199
17,198
101
16 Nov 2079
39,367
19,366
107
18 Oct 2091
43,721
23,720
119
17 Mar 2105
48,619
28,618
133
12 Jul 2151
65,537
45,536
179
25 Aug 2246
100,279
80,278
274
14 Mar 2270
108,881
88,880
298
15 Dec 2330
131,071
111,070
358
07 Apr 7789
2,124,679
2,104,678
5817
Ordinal
Day Age
Date
Age
1st
19
23 Feb 1972
0
2nd
31
06 Mar 1972
0
3rd
109
23 May 1972
0
4th
199
21 Aug 1972
0
5th
409
19 Mar 1973
1
6th
571
28 Aug 1973
1
7th
631
27 Oct 1973
1
8th
829
13 May 1974
2
9th
1,489
03 Mar 1976
4
10th
1,999
26 Jul 1977
5
11th
2,341
03 Jul 1978
6
12th
2,971
24 Mar 1980
8
13th
3,529
03 Oct 1981
9
14th
4,621
29 Sep 1984
12
15th
4,789
16 Mar 1985
13
16th
7,039
14 May 1991
19
17th
7,669
02 Feb 1993
20
18th
8,779
17 Feb 1996
24
19th
9,721
16 Sep 1998
26
20th
10,459
23 Sep 2000
28
21st
10,711
02 Jun 2001
29
22nd
13,681
20 Jul 2009
37
23rd
14,851
02 Oct 2012
40
24th
16,069
02 Feb 2016
43
25th
16,381
10 Dec 2016
44
26th
17,659
10 Jun 2020
48
27th
20,011
18 Nov 2026
54
1
28th
20,359
01 Nov 2027
55
29th
23,251
02 Oct 2035
63
30th
25,939
10 Feb 2043
71
31st
27,541
01 Jul 2047
75
32nd
29,191
06 Jan 2052
79
33rd
29,611
01 Mar 2053
81
34th
31,321
05 Nov 2057
85
35th
34,429
10 May 2066
94
36th
36,739
05 Sep 2072
100
37th
40,099
17 Nov 2081
109
38th
40,591
24 Mar 2083
111
39th
42,589
11 Sep 2088
116