1414141

Appears in sequences

• Palindromes k such that 3k + 1 is also a palindrome.at n=35A083829
• Palindromes n such that 4n + 1 is also a palindrome.at n=33A083831
• a(1)=4; for n>=1, a(n+1) is the smallest palindromic semiprime with a(n) as a central substring.at n=3A247483