‘Cyclic emirps,’ emirps that generate only more emirps when you move the 1st digit to the rear: 11,939 → 19,391 → 93,911 → 39,119 → 91,193 → 11,939... 193,939 → 939,391 → 393,919 → 939,193 → 391,939 → 919,393 → 193,939...pic.twitter.com/3PeCGleeX7
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‘Cyclic emirps,’ emirps that generate only more emirps when you move the 1st digit to the rear: 11,939 → 19,391 → 93,911 → 39,119 → 91,193 → 11,939... 193,939 → 939,391 → 393,919 → 939,193 → 391,939 → 919,393 → 193,939...pic.twitter.com/3PeCGleeX7
165479283 is Smallest number made by using digits from 1 to 9 containing maximum distinct primes when looking forward as well as backward. 2, 3, 5, 7, 29, 47, 61, 79, 83, 97, 283, 479, 547, 829, 4561, 5479, 6547, 8297, 9283, 16547, 65479, 74561, 79283, 165479,2974561, 65479283.
26 primes
Can 11111111111111111111111 be called a circular prime?
Oh, 11111111111111111111111 IS a prime number.
In similar fashion Roberto d’Anciovi (1868-1925) arranged the bread loaves in his massive Milanese ovens so that no loaf would touch another and cause an unsightly tear mark when they were separated. He was called “Primo” by his many admirers. His wife called him “Pazzo.”
Is this the only one?
199933 also
Thansk. Do anyone know is checking each integer from 0 to infinity the only way to find such nos.? 13 is a circular prime too... How many circular primes are there between, say 0 to 999999? And does 11 qualify for circular prime?
If you do not count the repunits, it is conjectured that 999331 is the largest circular prime (in base 10).
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