121921

Properties

Appears in sequences

• Smallest prime(k) such that the concatenation prime(k)//prime(k+1)//...//prime(k+n-1) represents an emirp.at n=27A173448
• Centered 15-gonal (or pentadecagonal) primes.at n=26A264822
• Bemirps that also interpret 2 and 5 as upside-down forms of each other, assuming a digital font.at n=14A335731
• Emirps p such that p, its digit reversal, and their squares are all quasi-Niven numbers.at n=2A356979
• Prime numbersat n=11467