1171875

Appears in sequences

• Numbers that are the sum of 3 nonzero 8th powers.at n=34A003381
• Expansion of g.f. (1 - 2*x)/(1 - 5*x).at n=9A005053
• Smallest label f(T) given to a rooted tree T with n nodes in Matula-Goebel labeling.at n=26A005517
• Least number which is side of n Pythagorean triples.at n=32A006593
• a(n) = 5^(n/2) for n even, a(n) = 3*5^((n-1)/2) for n odd.at n=17A056487
• Reciprocal of n terminates with an infinite repetition of digit 3. Multiples of 10 are omitted.at n=13A064562
• a(n) = (4*5^n + (-5)^n)/5.at n=9A083222
• Duplicate of A083222.at n=9A083298
• Numbers k such that k divides the concatenation of all divisors of k in ascending order other than 1 and k itself.at n=6A088376
• Expansion of (1 + 3x - 2x^2 - 12x^3)/(1 - 9x^2 + 20x^4).at n=17A097111
• a(n) divides the number formed by concatenating the sum of the digits of a(n) with a(n), by a factor not previously used.at n=13A101171
• a(1) = 1, a(2) = 3; for n >= 3, take a(n) to be the smallest odd number not occurring earlier such that a(n-1) divides the concatenation a(n-2)a(n).at n=17A111386
• a(3*n) = 3*a(3*n-1)-3*a(3*n-2)+2*a(3*n-3), a(3*n+1) = 3*a(3*n)-3*a(3*n-1)+2*a(3*n-2), a(3*n+2) = 3*a(3*n+1)-3*a(3*n) with a(0)=1, a(1)=2, a(2)=3.at n=26A133335
• a(4*n)=5^n, a(4*n+1)=2*5^n, a(4*n+2)=3*5^n, a(4*n+3)=4*5^n.at n=34A140730
• a(n) = 5*a(n-2) for n > 2; a(1) = 3, a(2) = 5.at n=16A163114
• a(n) = n^8*(n + 1)/2.at n=5A168675
• a(n) = (2n + 1)*5^n.at n=7A171220
• a(n) = 3*n^4.at n=25A219056
• Smallest odd number greater than any previous term such that it divides the concatenation of all the previous terms and itself; begin with 1.at n=25A228806
• a(n) = numerator( n^n/(2*n)! ).at n=15A244083