262121

Properties

Appears in sequences

• Primes of the form floor(k*(k+1)*Pi/2), k>=0, where Pi = 3.1415.. = A000796.at n=27A163579
• a(n) = ADPE(n) is the total number of aperiodic k-double-palindromes of n up to cyclic equivalence, where 1 <= k <= n.at n=34A181314
• Primes p such that q = p^2 - 2, r = q^2 - 2 and s = r^2 - 2 are also prime.at n=21A257552
• Total sum of parts which are cubes in all partitions of n.at n=40A342229
• a(n) is the minimum integer k such that the smallest prime factor of the n-th Fermat number exceeds 2^(2^n - k).at n=18A358684
• Prime numbersat n=22997