Every Day Counts
Centred Triangular Prime Days
 
Age: 23,232 days
Date of birth
Your 29th Centred Triangular Prime Day is on
Thursday
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
09 Jul 2026
23,251
19
63
09 Jul 2026
23,251
19
63
17 Sep 2026
23,321
89
63
12 Mar 2027
23,497
265
64
08 Jul 2028
23,981
749
65
27 Apr 2041
28,657
5,425
78
12 Apr 2045
30,103
6,871
82
15 Sep 2064
37,199
13,967
101
23 Aug 2070
39,367
16,135
107
25 Jul 2082
43,721
20,489
119
08 Sep 2084
44,497
21,265
121
22 Dec 2095
48,619
25,387
133
18 Apr 2142
65,537
42,305
179
01 Jun 2237
100,279
77,047
274
19 Dec 2260
108,881
85,649
298
21 Sep 2321
131,071
107,839
358
13 Jan 7780
2,124,679
2,101,447
5817
Ordinal
Day Age
Date
Age
1st
19
30 Nov 1962
0
2nd
31
12 Dec 1962
0
3rd
109
28 Feb 1963
0
4th
199
29 May 1963
0
5th
409
25 Dec 1963
1
6th
571
04 Jun 1964
1
7th
631
03 Aug 1964
1
8th
829
17 Feb 1965
2
9th
1,489
09 Dec 1966
4
10th
1,999
02 May 1968
5
11th
2,341
09 Apr 1969
6
12th
2,971
30 Dec 1970
8
13th
3,529
10 Jul 1972
9
14th
4,621
07 Jul 1975
12
15th
4,789
22 Dec 1975
13
16th
7,039
18 Feb 1982
19
17th
7,669
10 Nov 1983
20
18th
8,779
24 Nov 1986
24
19th
9,721
23 Jun 1989
26
20th
10,459
01 Jul 1991
28
21st
10,711
09 Mar 1992
29
22nd
13,681
26 Apr 2000
37
23rd
14,851
10 Jul 2003
40
24th
16,069
09 Nov 2006
43
25th
16,381
17 Sep 2007
44
26th
17,659
18 Mar 2011
48
27th
20,011
25 Aug 2017
54
28th
20,359
08 Aug 2018
55
29th
23,251
09 Jul 2026
63
1
30th
25,939
17 Nov 2033
71
31st
27,541
07 Apr 2038
75
32nd
29,191
13 Oct 2042
79
33rd
29,611
07 Dec 2043
81
34th
31,321
12 Aug 2048
85
35th
34,429
14 Feb 2057
94
36th
36,739
13 Jun 2063
100
37th
40,099
24 Aug 2072
109
38th
40,591
29 Dec 2073
111
39th
42,589
19 Jun 2079
116