26721

Appears in sequences

• Numbers k such that 89*2^k+1 is prime.at n=12A032394
• Solutions to A096509[x]=6; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 6.at n=30A096517
• a(n) = Sum_{i=0..n} digsum_9(i)^3, where digsum_9(i) = A053830(i).at n=57A231686
• Number of nX7 0..1 arrays with every element equal to 2 or 3 king-move adjacent elements, with upper left element zero.at n=13A297813
• Terms k of A228058 such that gcd(k - A048250(k), A162296(k) - k) = A162296(k) - k.at n=40A325376
• Numbers k in A228058 such that also A001065(k) is in A228058.at n=32A325380