Every Day Counts
Centred Triangular Prime Days
 
Age: 34,408 days
Date of birth
Your 35th Centred Triangular Prime Day is on
Wednesday
when you will be
34,429 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 Jun 2025
34,421
13
94
25 Jun 2025
34,429
21
94
17 Oct 2025
34,543
135
94
31 Jan 2026
34,649
241
94
30 Nov 2027
35,317
909
96
24 Jan 2033
37,199
2,791
101
01 Jan 2039
39,367
4,959
107
30 Aug 2049
43,261
8,853
118
03 Dec 2050
43,721
9,313
119
17 Jan 2053
44,497
10,089
121
01 May 2064
48,619
14,211
133
27 Aug 2110
65,537
31,129
179
10 Oct 2205
100,279
65,871
274
29 Apr 2229
108,881
74,473
298
29 Jan 2290
131,071
96,663
358
23 May 7748
2,124,679
2,090,271
5817
Ordinal
Day Age
Date
Age
1st
19
10 Apr 1931
0
2nd
31
22 Apr 1931
0
3rd
109
09 Jul 1931
0
4th
199
07 Oct 1931
0
5th
409
04 May 1932
1
6th
571
13 Oct 1932
1
7th
631
12 Dec 1932
1
8th
829
28 Jun 1933
2
9th
1,489
19 Apr 1935
4
10th
1,999
10 Sep 1936
5
11th
2,341
18 Aug 1937
6
12th
2,971
10 May 1939
8
13th
3,529
18 Nov 1940
9
14th
4,621
15 Nov 1943
12
15th
4,789
01 May 1944
13
16th
7,039
29 Jun 1950
19
17th
7,669
20 Mar 1952
20
18th
8,779
04 Apr 1955
24
19th
9,721
01 Nov 1957
26
20th
10,459
09 Nov 1959
28
21st
10,711
18 Jul 1960
29
22nd
13,681
04 Sep 1968
37
23rd
14,851
18 Nov 1971
40
24th
16,069
20 Mar 1975
43
25th
16,381
26 Jan 1976
44
26th
17,659
27 Jul 1979
48
27th
20,011
03 Jan 1986
54
28th
20,359
17 Dec 1986
55
29th
23,251
17 Nov 1994
63
30th
25,939
28 Mar 2002
71
31st
27,541
16 Aug 2006
75
32nd
29,191
21 Feb 2011
79
33rd
29,611
16 Apr 2012
81
34th
31,321
21 Dec 2016
85
35th
34,429
25 Jun 2025
94
1
36th
36,739
22 Oct 2031
100
37th
40,099
02 Jan 2041
109
38th
40,591
09 May 2042
111
39th
42,589
28 Oct 2047
116