Every Day Counts
Centred Triangular Prime Days
 
Age: 23,373 days
Date of birth
Your 30th Centred Triangular Prime Day is on
Saturday
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
11 Nov 2018
23,399
26
64
17 Feb 2019
23,497
124
64
15 Jun 2020
23,981
608
65
11 Apr 2021
24,281
908
66
25 Oct 2025
25,939
2,566
71
04 Apr 2033
28,657
5,284
78
20 Mar 2037
30,103
6,730
82
23 Aug 2056
37,199
13,826
101
31 Jul 2062
39,367
15,994
107
02 Jul 2074
43,721
20,348
119
16 Aug 2076
44,497
21,124
121
29 Nov 2087
48,619
25,246
133
26 Mar 2134
65,537
42,164
179
09 May 2229
100,279
76,906
274
26 Nov 2252
108,881
85,508
298
29 Aug 2313
131,071
107,698
358
21 Dec 7771
2,124,679
2,101,306
5817
Ordinal
Day Age
Date
Age
1st
19
07 Nov 1954
0
2nd
31
19 Nov 1954
0
3rd
109
05 Feb 1955
0
4th
199
06 May 1955
0
5th
409
02 Dec 1955
1
6th
571
12 May 1956
1
7th
631
11 Jul 1956
1
8th
829
25 Jan 1957
2
9th
1,489
16 Nov 1958
4
10th
1,999
09 Apr 1960
5
11th
2,341
17 Mar 1961
6
12th
2,971
07 Dec 1962
8
13th
3,529
17 Jun 1964
9
14th
4,621
14 Jun 1967
12
15th
4,789
29 Nov 1967
13
16th
7,039
26 Jan 1974
19
17th
7,669
18 Oct 1975
20
18th
8,779
01 Nov 1978
24
19th
9,721
31 May 1981
26
20th
10,459
08 Jun 1983
28
21st
10,711
15 Feb 1984
29
22nd
13,681
03 Apr 1992
37
23rd
14,851
17 Jun 1995
40
24th
16,069
17 Oct 1998
43
25th
16,381
25 Aug 1999
44
26th
17,659
23 Feb 2003
48
27th
20,011
02 Aug 2009
54
28th
20,359
16 Jul 2010
55
29th
23,251
16 Jun 2018
63
30th
25,939
25 Oct 2025
71
1
31st
27,541
15 Mar 2030
75
32nd
29,191
20 Sep 2034
79
33rd
29,611
14 Nov 2035
81
34th
31,321
20 Jul 2040
85
35th
34,429
22 Jan 2049
94
36th
36,739
21 May 2055
100
37th
40,099
01 Aug 2064
109
38th
40,591
06 Dec 2065
111
39th
42,589
27 May 2071
116