Every Day Counts
Centred Triangular Prime Days
 
Age: 23,250 days
Date of birth
Your 29th Centred Triangular Prime Day is on
Thursday
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
27 Jun 2024
23,251
tomorrow
63
27 Jun 2024
23,251
tomorrow
63
05 Sep 2024
23,321
71
63
28 Feb 2025
23,497
247
64
27 Jun 2026
23,981
731
65
16 Apr 2039
28,657
5,407
78
01 Apr 2043
30,103
6,853
82
04 Sep 2062
37,199
13,949
101
11 Aug 2068
39,367
16,117
107
13 Jul 2080
43,721
20,471
119
28 Aug 2082
44,497
21,247
121
10 Dec 2093
48,619
25,369
133
06 Apr 2140
65,537
42,287
179
21 May 2235
100,279
77,029
274
08 Dec 2258
108,881
85,631
298
10 Sep 2319
131,071
107,821
358
01 Jan 7778
2,124,679
2,101,429
5817
Ordinal
Day Age
Date
Age
1st
19
18 Nov 1960
0
2nd
31
30 Nov 1960
0
3rd
109
16 Feb 1961
0
4th
199
17 May 1961
0
5th
409
13 Dec 1961
1
6th
571
24 May 1962
1
7th
631
23 Jul 1962
1
8th
829
06 Feb 1963
2
9th
1,489
27 Nov 1964
4
10th
1,999
21 Apr 1966
5
11th
2,341
29 Mar 1967
6
12th
2,971
18 Dec 1968
8
13th
3,529
29 Jun 1970
9
14th
4,621
25 Jun 1973
12
15th
4,789
10 Dec 1973
13
16th
7,039
07 Feb 1980
19
17th
7,669
29 Oct 1981
20
18th
8,779
12 Nov 1984
24
19th
9,721
12 Jun 1987
26
20th
10,459
19 Jun 1989
28
21st
10,711
26 Feb 1990
29
22nd
13,681
15 Apr 1998
37
23rd
14,851
28 Jun 2001
40
24th
16,069
28 Oct 2004
43
25th
16,381
05 Sep 2005
44
26th
17,659
06 Mar 2009
48
27th
20,011
14 Aug 2015
54
28th
20,359
27 Jul 2016
55
29th
23,251
27 Jun 2024
63
1
30th
25,939
06 Nov 2031
71
31st
27,541
26 Mar 2036
75
32nd
29,191
01 Oct 2040
79
33rd
29,611
25 Nov 2041
81
34th
31,321
01 Aug 2046
85
35th
34,429
03 Feb 2055
94
36th
36,739
01 Jun 2061
100
37th
40,099
13 Aug 2070
109
38th
40,591
18 Dec 2071
111
39th
42,589
07 Jun 2077
116