Every Day Counts
Centred Triangular Prime Days
 
Age: 20,003 days
Date of birth
Your 27th Centred Triangular Prime Day is on
Monday
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
30 Dec 2024
20,011
8
54
30 Dec 2024
20,011
8
54
08 Jul 2025
20,201
198
55
11 Dec 2025
20,357
354
55
16 Aug 2029
21,701
1,698
59
01 Sep 2031
22,447
2,444
61
01 Sep 2048
28,657
8,654
78
17 Aug 2052
30,103
10,100
82
21 Jan 2072
37,199
17,196
101
28 Dec 2077
39,367
19,364
107
29 Nov 2089
43,721
23,718
119
29 Apr 2103
48,619
28,616
133
23 Aug 2149
65,537
45,534
179
06 Oct 2244
100,279
80,276
274
25 Apr 2268
108,881
88,878
298
26 Jan 2329
131,071
111,068
358
20 May 7787
2,124,679
2,104,676
5817
Ordinal
Day Age
Date
Age
1st
19
06 Apr 1970
0
2nd
31
18 Apr 1970
0
3rd
109
05 Jul 1970
0
4th
199
03 Oct 1970
0
5th
409
01 May 1971
1
6th
571
10 Oct 1971
1
7th
631
09 Dec 1971
1
8th
829
24 Jun 1972
2
9th
1,489
15 Apr 1974
4
10th
1,999
07 Sep 1975
5
11th
2,341
14 Aug 1976
6
12th
2,971
06 May 1978
8
13th
3,529
15 Nov 1979
9
14th
4,621
11 Nov 1982
12
15th
4,789
28 Apr 1983
13
16th
7,039
25 Jun 1989
19
17th
7,669
17 Mar 1991
20
18th
8,779
31 Mar 1994
24
19th
9,721
28 Oct 1996
26
20th
10,459
05 Nov 1998
28
21st
10,711
15 Jul 1999
29
22nd
13,681
01 Sep 2007
37
23rd
14,851
14 Nov 2010
40
24th
16,069
16 Mar 2014
43
25th
16,381
22 Jan 2015
44
26th
17,659
23 Jul 2018
48
27th
20,011
30 Dec 2024
54
1
28th
20,359
13 Dec 2025
55
29th
23,251
13 Nov 2033
63
30th
25,939
24 Mar 2041
71
31st
27,541
12 Aug 2045
75
32nd
29,191
17 Feb 2050
79
33rd
29,611
13 Apr 2051
81
34th
31,321
18 Dec 2055
85
35th
34,429
21 Jun 2064
94
36th
36,739
18 Oct 2070
100
37th
40,099
30 Dec 2079
109
38th
40,591
05 May 2081
111
39th
42,589
24 Oct 2086
116