4543454domain: NAppears in sequencesa(n) = Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; initial terms are 0,1,2.at n=26A049858Palindromes n with nonzero digits such that n +/- the product of digits of n are both palindromes.at n=31A244548