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Friday, April 3, 2026
The number 1,961 is one more than 1,960 and one less than 1,962. Although 1,961 looks like a prime, 1,961 is not prime. It was 64 years before 2025, and since 64 and 2025 are both squares, we can factor as the difference of squares: 1961 = 452 − 82 = (45 − 8)(45 + 8) = 37 × 53. You can confirm this on your calculator by multiplying 37 and 53 together, and the answer is indeed 1,961.
Did you know that 1,973 was the first prime year since 1,951? That’s a prime gap of 22.
- 1,957 = 19 × 103
- 1,963 = 13 × 151
- 1,967 = 7 × 281
- 1,969 = 11 × 179
There were five more prime years before 2000, those being 1979, 1987, 1993, 1997, and 1999.
- [ ] — e.g. December 31, 1999
- [ ] —
