Every Day Counts
Centred Triangular Prime Days
 
Age: 23,238 days
Date of birth
Your 29th Centred Triangular Prime Day is on
Sunday
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
22 Nov 2026
23,251
13
63
22 Nov 2026
23,251
13
63
31 Jan 2027
23,321
83
63
26 Jul 2027
23,497
259
64
21 Nov 2028
23,981
743
65
10 Sep 2041
28,657
5,419
78
26 Aug 2045
30,103
6,865
82
29 Jan 2065
37,199
13,961
101
06 Jan 2071
39,367
16,129
107
08 Dec 2082
43,721
20,483
119
22 Jan 2085
44,497
21,259
121
06 May 2096
48,619
25,381
133
01 Sep 2142
65,537
42,299
179
15 Oct 2237
100,279
77,041
274
04 May 2261
108,881
85,643
298
04 Feb 2322
131,071
107,833
358
28 May 7780
2,124,679
2,101,441
5817
Ordinal
Day Age
Date
Age
1st
19
15 Apr 1963
0
2nd
31
27 Apr 1963
0
3rd
109
14 Jul 1963
0
4th
199
12 Oct 1963
0
5th
409
09 May 1964
1
6th
571
18 Oct 1964
1
7th
631
17 Dec 1964
1
8th
829
03 Jul 1965
2
9th
1,489
24 Apr 1967
4
10th
1,999
15 Sep 1968
5
11th
2,341
23 Aug 1969
6
12th
2,971
15 May 1971
8
13th
3,529
23 Nov 1972
9
14th
4,621
20 Nov 1975
12
15th
4,789
06 May 1976
13
16th
7,039
04 Jul 1982
19
17th
7,669
25 Mar 1984
20
18th
8,779
09 Apr 1987
24
19th
9,721
06 Nov 1989
26
20th
10,459
14 Nov 1991
28
21st
10,711
23 Jul 1992
29
22nd
13,681
09 Sep 2000
37
23rd
14,851
23 Nov 2003
40
24th
16,069
25 Mar 2007
43
25th
16,381
31 Jan 2008
44
26th
17,659
01 Aug 2011
48
27th
20,011
08 Jan 2018
54
28th
20,359
22 Dec 2018
55
29th
23,251
22 Nov 2026
63
1
30th
25,939
02 Apr 2034
71
31st
27,541
21 Aug 2038
75
32nd
29,191
26 Feb 2043
79
33rd
29,611
21 Apr 2044
81
34th
31,321
26 Dec 2048
85
35th
34,429
30 Jun 2057
94
36th
36,739
27 Oct 2063
100
37th
40,099
07 Jan 2073
109
38th
40,591
14 May 2074
111
39th
42,589
02 Nov 2079
116