Every Day Counts
Centred Triangular Prime Days
 
Age: 25,937 days
Date of birth
Your 30th Centred Triangular Prime Day is on
Wednesday
when you will be
25,939 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
25 Jul 2018
25,939
2
71
25 Jul 2018
25,939
2
71
09 May 2019
26,227
290
71
28 Oct 2019
26,399
462
72
05 Aug 2020
26,681
744
73
02 Jan 2026
28,657
2,720
78
18 Dec 2029
30,103
4,166
82
23 May 2049
37,199
11,262
101
30 Apr 2055
39,367
13,430
107
01 Apr 2067
43,721
17,784
119
16 May 2069
44,497
18,560
121
28 Aug 2080
48,619
22,682
133
24 Dec 2126
65,537
39,600
179
06 Feb 2222
100,279
74,342
274
26 Aug 2245
108,881
82,944
298
29 May 2306
131,071
105,134
358
19 Sep 7764
2,124,679
2,098,742
5817
Ordinal
Day Age
Date
Age
1st
19
07 Aug 1947
0
2nd
31
19 Aug 1947
0
3rd
109
05 Nov 1947
0
4th
199
03 Feb 1948
0
5th
409
31 Aug 1948
1
6th
571
09 Feb 1949
1
7th
631
10 Apr 1949
1
8th
829
25 Oct 1949
2
9th
1,489
16 Aug 1951
4
10th
1,999
07 Jan 1953
5
11th
2,341
15 Dec 1953
6
12th
2,971
06 Sep 1955
8
13th
3,529
17 Mar 1957
9
14th
4,621
13 Mar 1960
12
15th
4,789
28 Aug 1960
13
16th
7,039
26 Oct 1966
19
17th
7,669
17 Jul 1968
20
18th
8,779
01 Aug 1971
24
19th
9,721
28 Feb 1974
26
20th
10,459
07 Mar 1976
28
21st
10,711
14 Nov 1976
29
22nd
13,681
01 Jan 1985
37
23rd
14,851
16 Mar 1988
40
24th
16,069
17 Jul 1991
43
25th
16,381
24 May 1992
44
26th
17,659
23 Nov 1995
48
27th
20,011
02 May 2002
54
28th
20,359
15 Apr 2003
55
29th
23,251
16 Mar 2011
63
30th
25,939
25 Jul 2018
71
1
31st
27,541
13 Dec 2022
75
32nd
29,191
20 Jun 2027
79
33rd
29,611
13 Aug 2028
81
34th
31,321
19 Apr 2033
85
35th
34,429
22 Oct 2041
94
36th
36,739
18 Feb 2048
100
37th
40,099
01 May 2057
109
38th
40,591
05 Sep 2058
111
39th
42,589
24 Feb 2064
116