30103

Properties

Appears in sequences

• Primes of form (p^x - 1)/(p^y - 1), p prime.at n=22A003424
• Palindromic reflectable primes.at n=12A007616
• Prime numbers that are the sum of the divisors of some n.at n=17A023195
• a(n)/100000 gives log_10(n) to 5 places.at n=1A027665
• Palindromes of form k^2 + k + 1.at n=8A028414
• Numbers that are palindromic in bases 8 and 10.at n=21A029804
• Palindromic primes in which parity of digits alternates.at n=18A030150
• Lucky numbers that are both palindromic and prime.at n=8A031881
• Lesser of two consecutive palindromes, both of which are prime.at n=12A032593
• Number of B-trees of order 4 with n leaves.at n=23A037026
• Base-10 palindromes that starts with 3.at n=23A043038
• Primes that are palindromic in bases 8 and 10.at n=6A046477
• Primes arising in A048969.at n=41A048977
• Primes arising in A048969.at n=37A048977
• Palindromic primes containing no pair of consecutive equal digits.at n=39A050784
• Every suffix of palindromic prime a(n) is prime (left-truncatable).at n=9A052024
• Palindromic primes whose sum of squared digits is also prime.at n=20A052035
• Primes of the form p^2 + p + 1 when p is prime.at n=11A053183
• Third term of balanced prime quartets: p(m-1)-p(m-2) = p(m)-p(m-1) = p(m+1)-p(m).at n=17A054802
• a(n) = p^2 + p + 1 where p runs through the primes.at n=39A060800