23628

Appears in sequences

• Least multiple k of prime(n) such that (k-1,k+1) forms a twin prime pair, or 0 if no such number exists.at n=40A090530
• Numbers n such that p(12n) is prime, where p(n) is the number of partitions of n.at n=26A115214
• 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=18A172294
• Number of length 3+1 0..n arrays with the sum of adjacent differences multiplied by some arrangement of +-1 equal to zero.at n=20A250168
• Numbers n such that the decimal expansions of both n and n^2 have 2 as smallest digit and 8 as largest digit.at n=33A257368
• Number of 6-cycles in the n X n knight graph.at n=16A289181
• The forgotten topological index of the Aztec diamond AZ(n) (see the Ramanes et al. reference, Theorem 2.1).at n=12A292346
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n) - n, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=18A296558
• Numbers on the square spiral board that are enclosed by four primes.at n=18A341542
• Area of the convex hull around terdragon expansion level n, measured in unit triangles.at n=9A343485
• Number of semi-sums of strict integer partitions of n.at n=46A366741
• Coefficient of x^n in the expansion of 1/( (1-x)^3 * (1-x^2)^3 )^n.at n=5A370271