25998

Appears in sequences

• Numbers k such that 6^k + 3^k + 2^k = A074528(k) is a prime.at n=16A125706
• Numbers k such that 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)-1 and 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)+1 are twin primes with p(h) = h-th prime.at n=43A129310
• Sequence of the "Natural Jewels": a natural jewel is a number that is totally enclosed by prime numbers in a version of Ulam Spiral.at n=19A172294
• Number of nonempty subsets of {1, 2, ..., n} with <=7 pairwise coprime elements.at n=29A187268
• Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=10A193047
• Numbers k such that k^3 - 1 and k^3 + 1 are both semiprimes.at n=7A268043
• Squarefree numbers n such that n^2 + 1 and n^2 - 1 are semiprime.at n=31A268697
• Start with 83; if even, divide by 2; if odd, add next three primes: Orbit of 83 under iterations of A174221, the "PrimeLatz" map.at n=25A293979
• a(n) = number of triangles with integer sides i <= j <= k with radius of circumcircle <= n.at n=35A331229
• Number of distinct intersections among all circles that can be constructed on vertices of an n-sided regular polygon, using only a compass.at n=20A331702
• Numbers on the square spiral board that are enclosed by four primes.at n=19A341542