Every Day Counts
Centred Triangular Prime Days
 
Age: 26,800 days
Date of birth
Your 31st Centred Triangular Prime Day is on
Monday
when you will be
27,541 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
04 Feb 2026
26,801
tomorrow
73
18 Aug 2027
27,361
561
74
14 Nov 2027
27,449
649
75
14 Feb 2028
27,541
741
75
06 Mar 2031
28,657
1,857
78
19 Feb 2035
30,103
3,303
82
25 Jul 2054
37,199
10,399
101
01 Jul 2060
39,367
12,567
107
02 Jun 2072
43,721
16,921
119
18 Jul 2074
44,497
17,697
121
30 Oct 2085
48,619
21,819
133
25 Feb 2132
65,537
38,737
179
10 Apr 2227
100,279
73,479
274
28 Oct 2250
108,881
82,081
298
31 Jul 2311
131,071
104,271
358
21 Nov 7769
2,124,679
2,097,879
5817
Ordinal
Day Age
Date
Age
1st
19
08 Oct 1952
0
2nd
31
20 Oct 1952
0
3rd
109
06 Jan 1953
0
4th
199
06 Apr 1953
0
5th
409
02 Nov 1953
1
6th
571
13 Apr 1954
1
7th
631
12 Jun 1954
1
8th
829
27 Dec 1954
2
9th
1,489
17 Oct 1956
4
10th
1,999
11 Mar 1958
5
11th
2,341
16 Feb 1959
6
12th
2,971
07 Nov 1960
8
13th
3,529
19 May 1962
9
14th
4,621
15 May 1965
12
15th
4,789
30 Oct 1965
13
16th
7,039
28 Dec 1971
19
17th
7,669
18 Sep 1973
20
18th
8,779
02 Oct 1976
24
19th
9,721
02 May 1979
26
20th
10,459
09 May 1981
28
21st
10,711
16 Jan 1982
29
22nd
13,681
05 Mar 1990
37
23rd
14,851
18 May 1993
40
24th
16,069
17 Sep 1996
43
25th
16,381
26 Jul 1997
44
26th
17,659
24 Jan 2001
48
27th
20,011
04 Jul 2007
54
28th
20,359
16 Jun 2008
55
29th
23,251
17 May 2016
63
30th
25,939
26 Sep 2023
71
31st
27,541
14 Feb 2028
75
1
32nd
29,191
21 Aug 2032
79
33rd
29,611
15 Oct 2033
81
34th
31,321
21 Jun 2038
85
35th
34,429
24 Dec 2046
94
36th
36,739
21 Apr 2053
100
37th
40,099
03 Jul 2062
109
38th
40,591
07 Nov 2063
111
39th
42,589
27 Apr 2069
116