38280

Appears in sequences

• Number of constrained mixed models with n factors.at n=6A079263
• Numbers that can be expressed as the difference of the squares of primes in exactly six distinct ways.at n=21A092002
• Numbers k such that prime(k) +/- k and prime(k) +/- 2k are all primes.at n=8A112530
• Main diagonal of triangle A132289: a(n) = A132289(n,n) for n>=0.at n=7A132290
• Numbers with prime factorization pqrst^3.at n=25A189984
• Number of solutions to x^2 + y^2 + z^2 + t^2 == n (mod 2*n) for x,y,z,t in [0, 2*n).at n=14A229294
• Number of non-congruent solutions of x^2 + y^2 + z^2 + t^2 == 0 mod n.at n=29A240547
• Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.at n=4A260240
• Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.at n=4A260245
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.at n=40A260248
• Numbers n such that the multiplicative group modulo n is the direct product of 6 cyclic groups.at n=29A272596
• a(n) = p*(p - 1)*(73*p^2 - 45*p + 14)/24, where p = prime(n).at n=4A273222
• Let x be the sum of the divisors d_i of k such that d_i | sigma(k). Sequence lists the numbers k for which x^2 = sigma(k).at n=4A284283
• Number of non-congruent solutions of x^2+y^2 == z^2+w^2 (mod n).at n=29A316148
• Number x such that sigma(x) = Sum_{i=1..k} {sigma(x/p_i)}, where p_i are the k prime factors of x.at n=4A324711
• Expansion of e.g.f. exp(x^2/(1-x)^4).at n=6A387244
• Least k such that k + A005117(i) is squarefree with i prime factors, for 1 <= i <= n.at n=3A389393