Every Day Counts
Centred Triangular Prime Days
 
Age: 29,722 days
Date of birth
Your 34th Centred Triangular Prime Day is on
Friday
when you will be
31,321 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
17 Oct 2018
29,723
tomorrow
81
01 Nov 2019
30,103
381
82
30 Jan 2021
30,559
837
83
03 Mar 2023
31,321
1,599
85
01 Nov 2028
33,391
3,669
91
10 Jan 2029
33,461
3,739
91
06 Apr 2039
37,199
7,477
101
13 Mar 2045
39,367
9,645
107
12 Feb 2057
43,721
13,999
119
30 Mar 2059
44,497
14,775
121
12 Jul 2070
48,619
18,897
133
06 Nov 2116
65,537
35,815
179
21 Dec 2211
100,279
70,557
274
10 Jul 2235
108,881
79,159
298
10 Apr 2296
131,071
101,349
358
03 Aug 7754
2,124,679
2,094,957
5817
Ordinal
Day Age
Date
Age
1st
19
20 Jun 1937
0
2nd
31
02 Jul 1937
0
3rd
109
18 Sep 1937
0
4th
199
17 Dec 1937
0
5th
409
15 Jul 1938
1
6th
571
24 Dec 1938
1
7th
631
22 Feb 1939
1
8th
829
08 Sep 1939
2
9th
1,489
29 Jun 1941
4
10th
1,999
21 Nov 1942
5
11th
2,341
29 Oct 1943
6
12th
2,971
20 Jul 1945
8
13th
3,529
29 Jan 1947
9
14th
4,621
25 Jan 1950
12
15th
4,789
12 Jul 1950
13
16th
7,039
08 Sep 1956
19
17th
7,669
31 May 1958
20
18th
8,779
14 Jun 1961
24
19th
9,721
12 Jan 1964
26
20th
10,459
19 Jan 1966
28
21st
10,711
28 Sep 1966
29
22nd
13,681
15 Nov 1974
37
23rd
14,851
28 Jan 1978
40
24th
16,069
30 May 1981
43
25th
16,381
07 Apr 1982
44
26th
17,659
06 Oct 1985
48
27th
20,011
15 Mar 1992
54
28th
20,359
26 Feb 1993
55
29th
23,251
27 Jan 2001
63
30th
25,939
07 Jun 2008
71
31st
27,541
26 Oct 2012
75
32nd
29,191
03 May 2017
79
33rd
29,611
27 Jun 2018
81
34th
31,321
03 Mar 2023
85
1
35th
34,429
05 Sep 2031
94
36th
36,739
01 Jan 2038
100
37th
40,099
15 Mar 2047
109
38th
40,591
19 Jul 2048
111
39th
42,589
07 Jan 2054
116