Every Day Counts
Centred Triangular Prime Days
 
Age: 23,235 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
23 Sep 2026
23,251
16
63
23 Sep 2026
23,251
16
63
02 Dec 2026
23,321
86
63
27 May 2027
23,497
262
64
22 Sep 2028
23,981
746
65
12 Jul 2041
28,657
5,422
78
27 Jun 2045
30,103
6,868
82
30 Nov 2064
37,199
13,964
101
07 Nov 2070
39,367
16,132
107
09 Oct 2082
43,721
20,486
119
23 Nov 2084
44,497
21,262
121
07 Mar 2096
48,619
25,384
133
03 Jul 2142
65,537
42,302
179
16 Aug 2237
100,279
77,044
274
05 Mar 2261
108,881
85,646
298
06 Dec 2321
131,071
107,836
358
29 Mar 7780
2,124,679
2,101,444
5817
Ordinal
Day Age
Date
Age
1st
19
14 Feb 1963
0
2nd
31
26 Feb 1963
0
3rd
109
15 May 1963
0
4th
199
13 Aug 1963
0
5th
409
10 Mar 1964
1
6th
571
19 Aug 1964
1
7th
631
18 Oct 1964
1
8th
829
04 May 1965
2
9th
1,489
23 Feb 1967
4
10th
1,999
17 Jul 1968
5
11th
2,341
24 Jun 1969
6
12th
2,971
16 Mar 1971
8
13th
3,529
24 Sep 1972
9
14th
4,621
21 Sep 1975
12
15th
4,789
07 Mar 1976
13
16th
7,039
05 May 1982
19
17th
7,669
25 Jan 1984
20
18th
8,779
08 Feb 1987
24
19th
9,721
07 Sep 1989
26
20th
10,459
15 Sep 1991
28
21st
10,711
24 May 1992
29
22nd
13,681
11 Jul 2000
37
23rd
14,851
24 Sep 2003
40
24th
16,069
24 Jan 2007
43
25th
16,381
02 Dec 2007
44
26th
17,659
02 Jun 2011
48
27th
20,011
09 Nov 2017
54
28th
20,359
23 Oct 2018
55
29th
23,251
23 Sep 2026
63
1
30th
25,939
01 Feb 2034
71
31st
27,541
22 Jun 2038
75
32nd
29,191
28 Dec 2042
79
33rd
29,611
21 Feb 2044
81
34th
31,321
27 Oct 2048
85
35th
34,429
01 May 2057
94
36th
36,739
28 Aug 2063
100
37th
40,099
08 Nov 2072
109
38th
40,591
15 Mar 2074
111
39th
42,589
03 Sep 2079
116