Every Day Counts
Centred Triangular Prime Days
 
Age: 17,663 days
Date of birth
Your 27th Centred Triangular Prime Day is on
Wednesday
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 Jan 2021
17,669
6
48
28 Nov 2021
17,971
308
49
26 Jun 2022
18,181
518
49
05 Nov 2022
18,313
650
50
05 Mar 2023
18,433
770
50
05 Oct 2024
19,013
1,350
52
18 Oct 2025
19,391
1,728
53
07 Dec 2025
19,441
1,778
53
17 Apr 2027
19,937
2,274
54
30 Jun 2027
20,011
2,348
54
02 Mar 2051
28,657
10,994
78
29 May 2092
43,721
26,058
119
27 Oct 2105
48,619
30,956
133
21 Feb 2152
65,537
47,874
179
06 Apr 2247
100,279
82,616
274
27 Jul 2331
131,071
113,408
358
17 Nov 7789
2,124,679
2,107,016
5817
Ordinal
Day Age
Date
Age
1st
19
04 Oct 1972
0
2nd
31
16 Oct 1972
0
3rd
109
02 Jan 1973
0
4th
199
02 Apr 1973
0
5th
409
29 Oct 1973
1
6th
571
09 Apr 1974
1
7th
631
08 Jun 1974
1
8th
829
23 Dec 1974
2
9th
1,489
13 Oct 1976
4
10th
1,999
07 Mar 1978
5
11th
2,341
12 Feb 1979
6
12th
2,971
03 Nov 1980
8
13th
3,529
15 May 1982
9
14th
4,621
11 May 1985
12
15th
4,789
26 Oct 1985
13
16th
7,039
24 Dec 1991
19
17th
7,669
14 Sep 1993
20
18th
8,779
28 Sep 1996
24
19th
9,721
28 Apr 1999
26
20th
10,459
05 May 2001
28
21st
10,711
12 Jan 2002
29
22nd
13,681
01 Mar 2010
37
23rd
14,851
14 May 2013
40
24th
16,069
13 Sep 2016
43
25th
16,381
22 Jul 2017
44
26th
17,659
20 Jan 2021
48
27th
20,011
30 Jun 2027
54
1
28th
20,359
12 Jun 2028
55
29th
23,251
13 May 2036
63
30th
25,939
22 Sep 2043
71
31st
27,541
10 Feb 2048
75
32nd
29,191
17 Aug 2052
79
33rd
29,611
11 Oct 2053
81
34th
31,321
17 Jun 2058
85
35th
34,429
20 Dec 2066
94
36th
36,739
17 Apr 2073
100
37th
40,099
29 Jun 2082
109
38th
40,591
03 Nov 2083
111
39th
42,589
23 Apr 2089
116