33180
domain: N
Appears in sequences
- Numbers n such that n | sigma_13(n).at n=35A055717
- Array defined in A064643 read from left to right (cf. A107783).at n=31A064644
- Numbers j such that j and 2j are both between a pair of twin primes.at n=11A066388
- Array defined in A064643 read in direction in which it was created.at n=32A107783
- n times n+9 gives the concatenation of two numbers m and m+8.at n=5A116347
- a(n) = lcm(n!,n!')/gcd(n!,n!'), where n!' is the arithmetic derivative of n! (A068311).at n=6A189100
- Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=n-w+|y-z|.at n=40A212684
- Antidiagonal sums of the convolution array A213822.at n=13A213824
- Numbers m such that exactly four subsets of {m-1, m, m+1} sum up to a prime number.at n=14A221310
- a(n) = 27*n^2 - 51*n + 24, n>=1.at n=35A304836