186621

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 3.at n=17A049956
• Numbers in base 10 that are palindromic in bases 6 and 7.at n=13A097931
• Twin prime products minus 2.at n=22A124659
• The first n-fold intrinsically 7-palindromic number (represented in base 10).at n=1A171706
• The first number palindromic with n digits in more than one base (shown in base 10).at n=6A171740
• Smallest palindromic number of 7 digits in two bases differing by n.at n=0A216901