Every Day Counts
Centred Triangular Prime Days
 
Age: 23,260 days
Date of birth
Your 30th Centred Triangular Prime Day is on
Monday
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
02 Aug 2024
23,269
9
63
23 Sep 2024
23,321
61
63
18 Mar 2025
23,497
237
64
15 Jul 2026
23,981
721
65
24 Nov 2031
25,939
2,679
71
04 May 2039
28,657
5,397
78
19 Apr 2043
30,103
6,843
82
22 Sep 2062
37,199
13,939
101
29 Aug 2068
39,367
16,107
107
31 Jul 2080
43,721
20,461
119
15 Sep 2082
44,497
21,237
121
28 Dec 2093
48,619
25,359
133
24 Apr 2140
65,537
42,277
179
08 Jun 2235
100,279
77,019
274
26 Dec 2258
108,881
85,621
298
28 Sep 2319
131,071
107,811
358
19 Jan 7778
2,124,679
2,101,419
5817
Ordinal
Day Age
Date
Age
1st
19
06 Dec 1960
0
2nd
31
18 Dec 1960
0
3rd
109
06 Mar 1961
0
4th
199
04 Jun 1961
0
5th
409
31 Dec 1961
1
6th
571
11 Jun 1962
1
7th
631
10 Aug 1962
1
8th
829
24 Feb 1963
2
9th
1,489
15 Dec 1964
4
10th
1,999
09 May 1966
5
11th
2,341
16 Apr 1967
6
12th
2,971
05 Jan 1969
8
13th
3,529
17 Jul 1970
9
14th
4,621
13 Jul 1973
12
15th
4,789
28 Dec 1973
13
16th
7,039
25 Feb 1980
19
17th
7,669
16 Nov 1981
20
18th
8,779
30 Nov 1984
24
19th
9,721
30 Jun 1987
26
20th
10,459
07 Jul 1989
28
21st
10,711
16 Mar 1990
29
22nd
13,681
03 May 1998
37
23rd
14,851
16 Jul 2001
40
24th
16,069
15 Nov 2004
43
25th
16,381
23 Sep 2005
44
26th
17,659
24 Mar 2009
48
27th
20,011
01 Sep 2015
54
28th
20,359
14 Aug 2016
55
29th
23,251
15 Jul 2024
63
30th
25,939
24 Nov 2031
71
1
31st
27,541
13 Apr 2036
75
32nd
29,191
19 Oct 2040
79
33rd
29,611
13 Dec 2041
81
34th
31,321
19 Aug 2046
85
35th
34,429
21 Feb 2055
94
36th
36,739
19 Jun 2061
100
37th
40,099
31 Aug 2070
109
38th
40,591
05 Jan 2072
111
39th
42,589
25 Jun 2077
116