23273

Appears in sequences

• Number of distinct values taken by 2^2^...^2 (with n 2's and parentheses inserted in all possible ways).at n=15A002845
• Numerators of n-th approximation of factorial (also called harmonic) expansion of Euler's constant gamma (A001620).at n=7A131447
• a(n) = 17*n^2.at n=37A244630
• Nonsemiprimes in A306097 = A121707 \ A267999.at n=32A321488
• Numbers p^2*q, p > q odd primes such that q does not divide p-1, and q does not divide p+1.at n=40A350421
• Numbers k such that k, k + 1 and k + 2 are 3 consecutive Niven (Harshad) numbers that are also divisible by a square.at n=4A359839
• Let G_n denote the planar graph defined in A358746 with the addition, if n is odd, of the circle containing the initial n points; sequence gives the number of edges in G_n.at n=16A370977