18125

Appears in sequences

• Numbers that are the sum of 2 nonzero squares in exactly 5 ways.at n=5A025288
• Numbers that are the sum of 2 nonzero squares in 5 or more ways.at n=15A025296
• Numbers that are the sum of 2 distinct nonzero squares in exactly 5 ways.at n=3A025306
• Numbers that are the sum of 2 distinct nonzero squares in 5 or more ways.at n=13A025315
• Numbers k such that k | 5^k + 4^k + 3^k + 2^k + 1^k.at n=43A056741
• Sum of terms of n-th group in A075383.at n=24A075386
• a(n) = 5^n*(n^3 - 3*n^2 + 2*n + 750)/750.at n=6A081916
• a(n) = 10*a(n-1) - 15*a(n-2), a(0)=1, a(1)=5.at n=5A084135
• Numbers n such that n + sigma(n) + phi(n) is a repdigit.at n=14A116029
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (-1, 1, -1), (0, 0, -1), (1, 0, 1)}.at n=9A149124
• a(n) = 5^(floor(n/2))+5^(floor(n/2)-1)-5^(floor((n-1)/3)).at n=11A170834
• a(n) is the smallest number of the form k*a(n-1)+a(n-2) for k>0 that is relatively prime to n, with a(0) = 0 and a(1) = 1.at n=19A206241
• G.f. satisfies: A(x) = x + 4*x^2 + x*A(A(A(A(A(x))))).at n=4A215118
• Numbers k such that phi(k) - k = phi(k') - k', where k' is the arithmetic derivative of k and phi(k) is the Euler totient function.at n=11A239940
• a(n) = 29*n^2.at n=25A244635
• Expansion of (Product_{k>0} (1 - x^k) / (1 - x^(5*k)))^5 in powers of x.at n=32A285932
• Numbers that are the sum of 2 squares in exactly 5 ways.at n=8A294716
• Expansion of Product_{i>=1, j>=1} (1 + x^(i*(2*j - 1))).at n=38A327731
• Number of partitions p of n such that (number of numbers in p that have multiplicity 1) > (number of numbers in p having multiplicity > 1).at n=40A329976
• Numbers in A231626 but not in A343302; first of 5 consecutive deficient numbers in arithmetic progression with common difference > 1.at n=29A343303