Every Day Counts
Centred Triangular Prime Days
 
Age: 23,245 days
Date of birth
Your 29th Centred Triangular Prime Day is on
Wednesday
when you will be
23,251 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
27 Nov 2024
23,251
6
63
27 Nov 2024
23,251
6
63
05 Feb 2025
23,321
76
63
31 Jul 2025
23,497
252
64
27 Nov 2026
23,981
736
65
16 Sep 2039
28,657
5,412
78
01 Sep 2043
30,103
6,858
82
04 Feb 2063
37,199
13,954
101
11 Jan 2069
39,367
16,122
107
13 Dec 2080
43,721
20,476
119
28 Jan 2083
44,497
21,252
121
12 May 2094
48,619
25,374
133
06 Sep 2140
65,537
42,292
179
21 Oct 2235
100,279
77,034
274
10 May 2259
108,881
85,636
298
10 Feb 2320
131,071
107,826
358
03 Jun 7778
2,124,679
2,101,434
5817
Ordinal
Day Age
Date
Age
1st
19
20 Apr 1961
0
2nd
31
02 May 1961
0
3rd
109
19 Jul 1961
0
4th
199
17 Oct 1961
0
5th
409
15 May 1962
1
6th
571
24 Oct 1962
1
7th
631
23 Dec 1962
1
8th
829
09 Jul 1963
2
9th
1,489
29 Apr 1965
4
10th
1,999
21 Sep 1966
5
11th
2,341
29 Aug 1967
6
12th
2,971
20 May 1969
8
13th
3,529
29 Nov 1970
9
14th
4,621
25 Nov 1973
12
15th
4,789
12 May 1974
13
16th
7,039
09 Jul 1980
19
17th
7,669
31 Mar 1982
20
18th
8,779
14 Apr 1985
24
19th
9,721
12 Nov 1987
26
20th
10,459
19 Nov 1989
28
21st
10,711
29 Jul 1990
29
22nd
13,681
15 Sep 1998
37
23rd
14,851
28 Nov 2001
40
24th
16,069
30 Mar 2005
43
25th
16,381
05 Feb 2006
44
26th
17,659
06 Aug 2009
48
27th
20,011
14 Jan 2016
54
28th
20,359
27 Dec 2016
55
29th
23,251
27 Nov 2024
63
1
30th
25,939
07 Apr 2032
71
31st
27,541
26 Aug 2036
75
32nd
29,191
03 Mar 2041
79
33rd
29,611
27 Apr 2042
81
34th
31,321
01 Jan 2047
85
35th
34,429
06 Jul 2055
94
36th
36,739
01 Nov 2061
100
37th
40,099
13 Jan 2071
109
38th
40,591
19 May 2072
111
39th
42,589
07 Nov 2077
116