102300

Appears in sequences

• Positive numbers k such that k and 3*k are anagrams in base 4 (written in base 4).at n=14A023060
• Positive numbers k such that k and 3*k are anagrams in base 7 (written in base 7).at n=36A023069
• a(n) = A062401(A065391(n)): phi(sigma(m)) peak values for numbers m (listed in A065391) at which those peaks are first reached.at n=30A065392
• Numbers j such that j and 2j are both between a pair of twin primes.at n=29A066388
• a(n) = AR(n) is the total number of aperiodic k-reverses of n.at n=24A180322
• Numbers m such that exactly four subsets of {m-1, m, m+1} sum up to a prime number.at n=32A221310
• Numbers m such that sigma(sigma(m))/m is a square.at n=41A318084