Every Day Counts
Centred Triangular Prime Days
 
Age: 13,747 days
Date of birth
Your 23rd Centred Triangular Prime Day is on
Saturday
when you will be
14,851 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
21 Dec 2018
13,751
4
37
11 Mar 2019
13,831
84
37
11 Mar 2020
14,197
450
38
03 Jun 2020
14,281
534
39
27 Jan 2021
14,519
772
39
25 Dec 2021
14,851
1,104
40
23 Jun 2025
16,127
2,380
44
29 Nov 2026
16,651
2,904
45
09 Jun 2027
16,843
3,096
46
24 Mar 2029
17,497
3,750
47
06 Feb 2031
18,181
4,434
49
31 May 2034
19,391
5,644
53
28 Nov 2035
19,937
6,190
54
13 Oct 2059
28,657
14,910
78
09 Jun 2114
48,619
34,872
133
03 Oct 2160
65,537
51,790
179
17 Nov 2255
100,279
86,532
274
08 Mar 2340
131,071
117,324
358
Ordinal
Day Age
Date
Age
1st
19
17 May 1981
0
2nd
31
29 May 1981
0
3rd
109
15 Aug 1981
0
4th
199
13 Nov 1981
0
5th
409
11 Jun 1982
1
6th
571
20 Nov 1982
1
7th
631
19 Jan 1983
1
8th
829
05 Aug 1983
2
9th
1,489
26 May 1985
4
10th
1,999
18 Oct 1986
5
11th
2,341
25 Sep 1987
6
12th
2,971
16 Jun 1989
8
13th
3,529
26 Dec 1990
9
14th
4,621
22 Dec 1993
12
15th
4,789
08 Jun 1994
13
16th
7,039
05 Aug 2000
19
17th
7,669
27 Apr 2002
20
18th
8,779
11 May 2005
24
19th
9,721
09 Dec 2007
26
20th
10,459
16 Dec 2009
28
21st
10,711
25 Aug 2010
29
22nd
13,681
12 Oct 2018
37
23rd
14,851
25 Dec 2021
40
1
24th
16,069
26 Apr 2025
43
25th
16,381
04 Mar 2026
44
26th
17,659
02 Sep 2029
48
27th
20,011
10 Feb 2036
54
28th
20,359
23 Jan 2037
55
29th
23,251
24 Dec 2044
63
30th
25,939
04 May 2052
71
31st
27,541
22 Sep 2056
75
32nd
29,191
30 Mar 2061
79
33rd
29,611
24 May 2062
81
34th
31,321
28 Jan 2067
85
35th
34,429
02 Aug 2075
94
36th
36,739
28 Nov 2081
100
37th
40,099
09 Feb 2091
109
38th
40,591
15 Jun 2092
111
39th
42,589
04 Dec 2097
116