400004

Appears in sequences

• Palindromes whose digits do not appear in previous term.at n=47A030285
• Palindromes with either no internal digits or all internal digits are 0.at n=49A109882
• Fixed points of permutations A118763, A118764, A118765 and A118766.at n=15A118767
• Numbers k such that the k-th triangular number contains only digits {0,1,8}.at n=17A119046
• Numbers whose decimal expansion contains only 0's and 4's.at n=33A169967
• Number of nX1 0..1 arrays with no 1 equal to more than one of its king-move neighbors, with the exception of exactly two elements.at n=20A282831
• Base-10 super-weak Skolem-Langford numbers.at n=7A339803