18495

Appears in sequences

• Numbers k such that k | 5^k + 4^k + 3^k + 2^k + 1^k.at n=45A056741
• Numbers n such that phi(n)+phi(n+1)=n+1.at n=29A067798
• (Sum of composites among next n numbers)-(sum of primes among next n numbers).at n=36A094338
• a(n) = 16n^2 + 32n + 15.at n=33A141759
• a(n) = 64*n^2 - 1.at n=16A158684
• a(n) = (n-1)*(n+2)*(n^2 + n + 2)/4.at n=15A168566
• Triangle read by rows: T(n,k) is the number of dispersed Dyck paths of length n (i.e., Motzkin paths of length n with no (1,0)-steps at positive heights) having k DHU's (here U=(1,1), H=(1,0), and D=(1,-1)).at n=52A191397
• Deficient numbers n having a companion m > n such that sigma(n)/n = sigma(m)/m.at n=32A212608
• Numbers k such that tau(k+1) - tau(k) = 5, where tau(k) = the number of divisors of k (A000005).at n=16A228453
• a(n) = Sum_{i=0..n} digsum_8(i)^3, where digsum_8(i) = A053829(i).at n=50A231682
• a(n) = n*(6*n^2 - 8*n + 3).at n=15A272378
• Numbers of the form 16n^2 + 32n + 15 for which the central region of its symmetric representation of sigma consists of two subparts of sizes 4n+7 and 4n+1, n>=0.at n=27A335574
• Starts of runs of 3 consecutive anti-tau numbers (A046642).at n=31A341780