18887

Appears in sequences

• Positive numbers k such that k and 4*k are anagrams in base 9 (written in base 9).at n=30A023081
• 'Reverse and Add!' trajectory of 1997.at n=2A063054
• Integers n > 1997 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 1997.at n=35A063055
• Integers n such that n = A067030(j) for some j and A067286(j) < A067034(j).at n=20A068798
• a(n)=A069523(n)/n.at n=52A088393
• Convoluted convolved Fibonacci numbers G_6^(r).at n=31A089111
• Divisors of 10^16 - 1.at n=42A111211
• 11 times pentagonal numbers: 11*n*(3n-1)/2.at n=34A153449
• Number of (w,x,y,z) with all terms in {1,...,n} and w+y=|x-y|+|y-z|.at n=33A212677
• Sphenic numbers k = p*q*r such that reversal(k) is also a sphenic number and reversal(k) = reversal(p)*reversal(q)*reversal(r).at n=17A242726
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 73", based on the 5-celled von Neumann neighborhood.at n=29A270089
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 73", based on the 5-celled von Neumann neighborhood.at n=30A270089
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 595", based on the 5-celled von Neumann neighborhood.at n=26A273142
• Number of distinct products i*j*k*l*m for 1 <= i <= j <= k <= l <= m <= n.at n=25A284988
• a(n) = [x^n] Product_{k>=2} (1 + x^k)^n.at n=11A319671
• Products of three distinct strong primes.at n=13A363782
• Positions of records in A032662.at n=9A376002
• Number of integer partitions of n with the same number of adjacent equal parts as adjacent unequal parts.at n=51A385574