Every Day Counts
Centred Triangular Prime Days
 
Age: 29,198 days
Date of birth
Your 33rd Centred Triangular Prime Day is on
Saturday
when you will be
29,611 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
03 Nov 2020
29,201
3
79
03 Jul 2021
29,443
245
80
18 Dec 2021
29,611
413
81
24 Apr 2023
30,103
905
82
24 Apr 2032
33,391
4,193
91
03 Jul 2032
33,461
4,263
91
27 Sep 2042
37,199
8,001
101
03 Sep 2048
39,367
10,169
107
05 Aug 2060
43,721
14,523
119
20 Sep 2062
44,497
15,299
121
02 Jan 2074
48,619
19,421
133
29 Apr 2120
65,537
36,339
179
13 Jun 2215
100,279
71,081
274
31 Dec 2238
108,881
79,683
298
02 Oct 2299
131,071
101,873
358
24 Jan 7758
2,124,679
2,095,481
5817
Ordinal
Day Age
Date
Age
1st
19
11 Dec 1940
0
2nd
31
23 Dec 1940
0
3rd
109
11 Mar 1941
0
4th
199
09 Jun 1941
0
5th
409
05 Jan 1942
1
6th
571
16 Jun 1942
1
7th
631
15 Aug 1942
1
8th
829
01 Mar 1943
2
9th
1,489
20 Dec 1944
4
10th
1,999
14 May 1946
5
11th
2,341
21 Apr 1947
6
12th
2,971
10 Jan 1949
8
13th
3,529
22 Jul 1950
9
14th
4,621
18 Jul 1953
12
15th
4,789
02 Jan 1954
13
16th
7,039
01 Mar 1960
19
17th
7,669
21 Nov 1961
20
18th
8,779
05 Dec 1964
24
19th
9,721
05 Jul 1967
26
20th
10,459
12 Jul 1969
28
21st
10,711
21 Mar 1970
29
22nd
13,681
08 May 1978
37
23rd
14,851
21 Jul 1981
40
24th
16,069
20 Nov 1984
43
25th
16,381
28 Sep 1985
44
26th
17,659
29 Mar 1989
48
27th
20,011
06 Sep 1995
54
28th
20,359
19 Aug 1996
55
29th
23,251
20 Jul 2004
63
30th
25,939
29 Nov 2011
71
31st
27,541
18 Apr 2016
75
32nd
29,191
24 Oct 2020
79
33rd
29,611
18 Dec 2021
81
1
34th
31,321
24 Aug 2026
85
35th
34,429
26 Feb 2035
94
36th
36,739
24 Jun 2041
100
37th
40,099
05 Sep 2050
109
38th
40,591
10 Jan 2052
111
39th
42,589
30 Jun 2057
116