78187domain: NAppears in sequencesPalindromes of the form 3n + 1 where n is also a palindrome: palindromes arising in A083829.at n=27A083830Palindromes of the form 6n + 1 where n is also a palindrome. palindromes arising in A083835.at n=9A083836G.f.: Sum_{n>=0} (1 + x*(1+x)^n)^n * x^n.at n=12A337721