Every Day Counts
Centred Triangular Prime Days
 
Age: 27,526 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
19 Oct 2026
27,527
tomorrow
75
02 Nov 2026
27,541
15
75
17 Jun 2029
28,499
973
78
22 Nov 2029
28,657
1,131
78
07 Nov 2033
30,103
2,577
82
08 Nov 2042
33,391
5,865
91
12 Apr 2053
37,199
9,673
101
20 Mar 2059
39,367
11,841
107
19 Feb 2071
43,721
16,195
119
05 Apr 2073
44,497
16,971
121
18 Jul 2084
48,619
21,093
133
13 Nov 2130
65,537
38,011
179
27 Dec 2225
100,279
72,753
274
16 Jul 2249
108,881
81,355
298
18 Apr 2310
131,071
103,545
358
09 Aug 7768
2,124,679
2,097,153
5817
Ordinal
Day Age
Date
Age
1st
19
27 Jun 1951
0
2nd
31
09 Jul 1951
0
3rd
109
25 Sep 1951
0
4th
199
24 Dec 1951
0
5th
409
21 Jul 1952
1
6th
571
30 Dec 1952
1
7th
631
28 Feb 1953
1
8th
829
14 Sep 1953
2
9th
1,489
06 Jul 1955
4
10th
1,999
27 Nov 1956
5
11th
2,341
04 Nov 1957
6
12th
2,971
27 Jul 1959
8
13th
3,529
04 Feb 1961
9
14th
4,621
01 Feb 1964
12
15th
4,789
18 Jul 1964
13
16th
7,039
15 Sep 1970
19
17th
7,669
06 Jun 1972
20
18th
8,779
21 Jun 1975
24
19th
9,721
18 Jan 1978
26
20th
10,459
26 Jan 1980
28
21st
10,711
04 Oct 1980
29
22nd
13,681
21 Nov 1988
37
23rd
14,851
04 Feb 1992
40
24th
16,069
06 Jun 1995
43
25th
16,381
13 Apr 1996
44
26th
17,659
13 Oct 1999
48
27th
20,011
22 Mar 2006
54
28th
20,359
05 Mar 2007
55
29th
23,251
03 Feb 2015
63
30th
25,939
14 Jun 2022
71
31st
27,541
02 Nov 2026
75
1
32nd
29,191
10 May 2031
79
33rd
29,611
03 Jul 2032
81
34th
31,321
09 Mar 2037
85
35th
34,429
11 Sep 2045
94
36th
36,739
08 Jan 2052
100
37th
40,099
21 Mar 2061
109
38th
40,591
26 Jul 2062
111
39th
42,589
14 Jan 2068
116