100120

Appears in sequences

• Positive numbers k such that k and 2*k are anagrams of each other in base 3 (k is written here in base 3).at n=6A023058
• Multiples of 4 whose digits add to 4.at n=27A063997
• a(n) is the least positive integer such that for 1 <= k <= n, the concatenation of the k terms a(n-k+1) through a(n) is a multiple of k.at n=12A096085
• Smallest number with n nonprime substrings (Version 3: substrings with leading zeros are counted as nonprime if the corresponding number is not a prime).at n=16A213304
• "Inside numbers". Pick a term "t" and one of its digits "d". Now jump to the right over d digits if "d" is odd, and to the left over d digits if "d" is even. Whatever the "d" you choose, you will stay on "t".at n=46A284515
• Number of non-averaging permutations of [n] with first element ceiling(n/2).at n=19A296531