Every Day Counts
Centred Triangular Prime Days
 
Age: 20,018 days
Date of birth
Your 28th Centred Triangular Prime Day is on
Sunday
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
26 Jan 2018
20,021
3
54
25 Jul 2018
20,201
183
55
28 Dec 2018
20,357
339
55
30 Dec 2018
20,359
341
55
02 Sep 2022
21,701
1,683
59
17 Sep 2024
22,447
2,429
61
18 Sep 2041
28,657
8,639
78
03 Sep 2045
30,103
10,085
82
06 Feb 2065
37,199
17,181
101
14 Jan 2071
39,367
19,349
107
16 Dec 2082
43,721
23,703
119
14 May 2096
48,619
28,601
133
09 Sep 2142
65,537
45,519
179
23 Oct 2237
100,279
80,261
274
12 May 2261
108,881
88,863
298
12 Feb 2322
131,071
111,053
358
05 Jun 7780
2,124,679
2,104,661
5817
Ordinal
Day Age
Date
Age
1st
19
23 Apr 1963
0
2nd
31
05 May 1963
0
3rd
109
22 Jul 1963
0
4th
199
20 Oct 1963
0
5th
409
17 May 1964
1
6th
571
26 Oct 1964
1
7th
631
25 Dec 1964
1
8th
829
11 Jul 1965
2
9th
1,489
02 May 1967
4
10th
1,999
23 Sep 1968
5
11th
2,341
31 Aug 1969
6
12th
2,971
23 May 1971
8
13th
3,529
01 Dec 1972
9
14th
4,621
28 Nov 1975
12
15th
4,789
14 May 1976
13
16th
7,039
12 Jul 1982
19
17th
7,669
02 Apr 1984
20
18th
8,779
17 Apr 1987
24
19th
9,721
14 Nov 1989
26
20th
10,459
22 Nov 1991
28
21st
10,711
31 Jul 1992
29
22nd
13,681
17 Sep 2000
37
23rd
14,851
01 Dec 2003
40
24th
16,069
02 Apr 2007
43
25th
16,381
08 Feb 2008
44
26th
17,659
09 Aug 2011
48
27th
20,011
16 Jan 2018
54
28th
20,359
30 Dec 2018
55
1
29th
23,251
30 Nov 2026
63
30th
25,939
10 Apr 2034
71
31st
27,541
29 Aug 2038
75
32nd
29,191
06 Mar 2043
79
33rd
29,611
29 Apr 2044
81
34th
31,321
03 Jan 2049
85
35th
34,429
08 Jul 2057
94
36th
36,739
04 Nov 2063
100
37th
40,099
15 Jan 2073
109
38th
40,591
22 May 2074
111
39th
42,589
10 Nov 2079
116