Every Day Counts
Centred Triangular Prime Days
 
Age: 20,012 days
Date of birth
Your 28th Centred Triangular Prime Day is on
Thursday
when you will be
20,359 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
09 Mar 2021
20,021
9
54
05 Sep 2021
20,201
189
55
08 Feb 2022
20,357
345
55
10 Feb 2022
20,359
347
55
14 Oct 2025
21,701
1,689
59
30 Oct 2027
22,447
2,435
61
30 Oct 2044
28,657
8,645
78
15 Oct 2048
30,103
10,091
82
20 Mar 2068
37,199
17,187
101
25 Feb 2074
39,367
19,355
107
27 Jan 2086
43,721
23,709
119
26 Jun 2099
48,619
28,607
133
21 Oct 2145
65,537
45,525
179
04 Dec 2240
100,279
80,267
274
23 Jun 2264
108,881
88,869
298
26 Mar 2325
131,071
111,059
358
18 Jul 7783
2,124,679
2,104,667
5817
Ordinal
Day Age
Date
Age
1st
19
04 Jun 1966
0
2nd
31
16 Jun 1966
0
3rd
109
02 Sep 1966
0
4th
199
01 Dec 1966
0
5th
409
29 Jun 1967
1
6th
571
08 Dec 1967
1
7th
631
06 Feb 1968
1
8th
829
22 Aug 1968
2
9th
1,489
13 Jun 1970
4
10th
1,999
05 Nov 1971
5
11th
2,341
12 Oct 1972
6
12th
2,971
04 Jul 1974
8
13th
3,529
13 Jan 1976
9
14th
4,621
09 Jan 1979
12
15th
4,789
26 Jun 1979
13
16th
7,039
23 Aug 1985
19
17th
7,669
15 May 1987
20
18th
8,779
29 May 1990
24
19th
9,721
26 Dec 1992
26
20th
10,459
03 Jan 1995
28
21st
10,711
12 Sep 1995
29
22nd
13,681
30 Oct 2003
37
23rd
14,851
12 Jan 2007
40
24th
16,069
14 May 2010
43
25th
16,381
22 Mar 2011
44
26th
17,659
20 Sep 2014
48
27th
20,011
27 Feb 2021
54
28th
20,359
10 Feb 2022
55
1
29th
23,251
11 Jan 2030
63
30th
25,939
22 May 2037
71
31st
27,541
10 Oct 2041
75
32nd
29,191
17 Apr 2046
79
33rd
29,611
11 Jun 2047
81
34th
31,321
15 Feb 2052
85
35th
34,429
19 Aug 2060
94
36th
36,739
16 Dec 2066
100
37th
40,099
27 Feb 2076
109
38th
40,591
03 Jul 2077
111
39th
42,589
22 Dec 2082
116