30015

Appears in sequences

• a(n) is the least k > 0 such that k and 3k are anagrams in base n (written in base 10).at n=26A023095
• Numbers k such that k-th and (k+1)-st term of A038593 differ by 4.at n=16A038635
• Numbers n divisible by exactly two nontrivial permutations (rearrangements) of the digits of n.at n=24A090057
• 10-gonal numbers which are divisible by the sum of their digits.at n=31A119548
• Numbers of the form 86+p^2 (where p is a prime).at n=39A138692
• Equals one maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, vertical and antidiagonal neighbors in a random 0..2 nX3 array.at n=4A220807
• Equals one maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, vertical and antidiagonal neighbors in a random 0..2 nX5 array.at n=2A220809
• T(n,k)=Equals one maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, vertical and antidiagonal neighbors in a random 0..2 nXk array.at n=23A220810
• T(n,k)=Equals one maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, vertical and antidiagonal neighbors in a random 0..2 nXk array.at n=25A220810
• Numbers k such that k and k+1 are both phi-practical numbers (A260653).at n=32A330871
• Number of subsets of {1..n} whose cardinality is equal to the average of the elements.at n=20A339484
• Numbers m such that both m^2-1 and m^2 are refactorable numbers (A033950) and that m^2 has more divisors than m^2-1.at n=15A342970