2864599

Properties

Appears in sequences

• Base-3 representation of a(n) is the concatenation of the base-3 representations of 1, 2, ..., n, n-1, ..., 1.at n=5A260853
• Primes whose base-b representation is the concatenation of the base-b representations of (1, 2, ..., k, k-1, ..., 1), for some b > 1 and some k > 1.at n=4A260871
• Prime numbersat n=207755