Every Day Counts
Centred Triangular Prime Days
 
Age: 17,652 days
Date of birth
Your 26th Centred Triangular Prime Day is on
Monday
when you will be
17,659 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
25 May 2024
17,657
5
48
27 May 2024
17,659
7
48
04 Apr 2025
17,971
319
49
31 Oct 2025
18,181
529
49
12 Mar 2026
18,313
661
50
10 Jul 2026
18,433
781
50
10 Feb 2028
19,013
1,361
52
22 Feb 2029
19,391
1,739
53
13 Apr 2029
19,441
1,789
53
22 Aug 2030
19,937
2,285
54
07 Jul 2054
28,657
11,005
78
04 Oct 2095
43,721
26,069
119
03 Mar 2109
48,619
30,967
133
28 Jun 2155
65,537
47,885
179
11 Aug 2250
100,279
82,627
274
01 Dec 2334
131,071
113,419
358
24 Mar 7793
2,124,679
2,107,027
5817
Ordinal
Day Age
Date
Age
1st
19
09 Feb 1976
0
2nd
31
21 Feb 1976
0
3rd
109
09 May 1976
0
4th
199
07 Aug 1976
0
5th
409
05 Mar 1977
1
6th
571
14 Aug 1977
1
7th
631
13 Oct 1977
1
8th
829
29 Apr 1978
2
9th
1,489
18 Feb 1980
4
10th
1,999
12 Jul 1981
5
11th
2,341
19 Jun 1982
6
12th
2,971
10 Mar 1984
8
13th
3,529
19 Sep 1985
9
14th
4,621
15 Sep 1988
12
15th
4,789
02 Mar 1989
13
16th
7,039
30 Apr 1995
19
17th
7,669
19 Jan 1997
20
18th
8,779
03 Feb 2000
24
19th
9,721
02 Sep 2002
26
20th
10,459
09 Sep 2004
28
21st
10,711
19 May 2005
29
22nd
13,681
06 Jul 2013
37
23rd
14,851
18 Sep 2016
40
24th
16,069
19 Jan 2020
43
25th
16,381
26 Nov 2020
44
26th
17,659
27 May 2024
48
1
27th
20,011
04 Nov 2030
54
28th
20,359
18 Oct 2031
55
29th
23,251
18 Sep 2039
63
30th
25,939
27 Jan 2047
71
31st
27,541
17 Jun 2051
75
32nd
29,191
23 Dec 2055
79
33rd
29,611
15 Feb 2057
81
34th
31,321
22 Oct 2061
85
35th
34,429
26 Apr 2070
94
36th
36,739
22 Aug 2076
100
37th
40,099
03 Nov 2085
109
38th
40,591
10 Mar 2087
111
39th
42,589
28 Aug 2092
116