Born: 26 Dec 1937
Died: 11 Apr 2020 (82 years)
John Conway
Mathematician
He would have celebrated his 253rd Triangular Day on 15 December 2025 at 32,131 days.
These occur when your day age is a triangular number.
Day age
Days ahead
Year age
15 Dec 2025
32,131
253rd
Triangular Day
74
88
Day age
Year age
252nd
31,878
87
253rd
32,131
87
254th
32,385
88
255th
32,640
89
256th
32,896
90
257th
33,153
90
258th
33,411
91
259th
33,670
92
260th
33,930
92
261st
34,191
93
262nd
34,453
94
263rd
34,716
95
264th
34,980
95
265th
35,245
96
266th
35,511
97
267th
35,778
97
268th
36,046
98
269th
36,315
99
270th
36,585
100
271st
36,856
100
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