18875

Appears in sequences

• Number of partitions of n that do not contain 5 as a part.at n=39A027339
• Composite numbers whose prime factors contain no digits other than 1 and 5.at n=25A036305
• Sums of 3 distinct powers of 5.at n=33A038475
• Numbers n such that n | 5^n + 4^n + 1.at n=23A057302
• a(n) = (7*n^3 + 6*n^2 + 5*n) / 6.at n=25A101165
• a(n) is the smallest number k larger than a(n-1) such that n*d(k)*sopf(k)=sigma(k), where d is the number of divisors (A000005) and sopf the sum of prime factors without repetition (A008472).at n=18A134382
• 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, 1, -1), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.at n=8A149612
• Partial sums of A000132.at n=26A175360
• Numbers m such that there are precisely 17 groups of order m.at n=10A294949
• Number of compositions (ordered partitions) of n into hexagonal numbers (A000384).at n=41A322798