50700

Appears in sequences

• "CHK" (necklace, identity, unlabeled) transform of 1, 2, 3, 4, ...at n=13A032170
• Number of rods required to make a 3-D cube of side length n.at n=25A059986
• Numbers k such that (1/k) * Sum_{d|k} d*sigma(d) is an integer.at n=16A069520
• Inverse EULER transform of A064831 (with its initial 1 omitted).at n=14A072337
• a(n) = the number of occurrences of 1 in all compositions of n without 2's = # of occurrences of the integer k in compositions of n+k-1 without 2's (k > 2).at n=17A079662
• Numbers n that are the hypotenuse of exactly 12 distinct integer-sided right triangles, i.e., n^2 can be written as a sum of two squares in 12 ways.at n=20A097226
• a(n) = (n+1)^2 * (n+2)^2 * (2*n+3) / 12.at n=11A108674
• Row sums of triangle A115237.at n=38A115238
• Numbers k for which 2*k-1, 4*k-1, 8*k-1 and 16*k-1 are primes.at n=36A124494
• Numbers with prime factorization pq^2r^2s^2.at n=26A189344
• a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^2, where Lucas(n) = A000204(n).at n=13A203853
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y>3z.at n=26A212510
• Number of (w,x,y,z) with all terms in {0,...,n}, w odd, x and y even.at n=24A212761
• Number of binary strings of length n+5 such that the smallest number whose binary representation is not visible in the string is 7.at n=13A261443
• Magic sums of 4 X 4 magic squares composed of odd squares.at n=29A271582
• Numbers k such that k mod phi(k) = lambda(k).at n=33A290184
• a(n) = n*(1 - (-1)^n - 2*(3 + (-1)^n)*n^2 + 2*n^4)/384.at n=25A350689
• a(n) is the least number k such that A093653(k)/A000120(k) = n.at n=37A360642