Every Day Counts
Centred Triangular Prime Days
 
Age: 16,196 days
Date of birth
Your 25th Centred Triangular Prime Day is on
Monday
when you will be
16,381 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
07 Dec 2018
16,217
21
44
30 Apr 2019
16,361
165
44
20 May 2019
16,381
185
44
20 May 2019
16,381
185
44
20 May 2019
16,381
185
44
14 Feb 2020
16,651
455
45
24 Aug 2020
16,843
647
46
09 Jun 2022
17,497
1,301
47
23 Apr 2024
18,181
1,985
49
16 Aug 2027
19,391
3,195
53
12 Feb 2029
19,937
3,741
54
28 Dec 2052
28,657
12,461
78
27 Mar 2094
43,721
27,525
119
25 Aug 2107
48,619
32,423
133
19 Dec 2153
65,537
49,341
179
01 Feb 2249
100,279
84,083
274
24 May 2333
131,071
114,875
358
Ordinal
Day Age
Date
Age
1st
19
02 Aug 1974
0
2nd
31
14 Aug 1974
0
3rd
109
31 Oct 1974
0
4th
199
29 Jan 1975
0
5th
409
27 Aug 1975
1
6th
571
05 Feb 1976
1
7th
631
05 Apr 1976
1
8th
829
20 Oct 1976
2
9th
1,489
11 Aug 1978
4
10th
1,999
03 Jan 1980
5
11th
2,341
10 Dec 1980
6
12th
2,971
01 Sep 1982
8
13th
3,529
12 Mar 1984
9
14th
4,621
09 Mar 1987
12
15th
4,789
24 Aug 1987
13
16th
7,039
21 Oct 1993
19
17th
7,669
13 Jul 1995
20
18th
8,779
27 Jul 1998
24
19th
9,721
23 Feb 2001
26
20th
10,459
03 Mar 2003
28
21st
10,711
10 Nov 2003
29
22nd
13,681
28 Dec 2011
37
23rd
14,851
12 Mar 2015
40
24th
16,069
12 Jul 2018
43
25th
16,381
20 May 2019
44
1
26th
17,659
18 Nov 2022
48
27th
20,011
27 Apr 2029
54
28th
20,359
10 Apr 2030
55
29th
23,251
11 Mar 2038
63
30th
25,939
20 Jul 2045
71
31st
27,541
08 Dec 2049
75
32nd
29,191
15 Jun 2054
79
33rd
29,611
09 Aug 2055
81
34th
31,321
14 Apr 2060
85
35th
34,429
17 Oct 2068
94
36th
36,739
13 Feb 2075
100
37th
40,099
26 Apr 2084
109
38th
40,591
31 Aug 2085
111
39th
42,589
19 Feb 2091
116