1004001

Appears in sequences

• Numbers k such that k^2 contains only digits {0,1,8}, not ending with zero.at n=13A058421
• Palindromes that are the sum of two shorter palindromes.at n=21A062696
• Palindromes n for which there is a unique k such that n = k + reverse(k).at n=19A068065
• Triangle read by rows in which row n gives n smallest palindromic numbers of n digits each.at n=25A081930
• Palindromic primes in base 6 (written in base 6).at n=31A117701
• Numbers k such that k and k^2 use only the digits 0, 1, 3, 4 and 8.at n=30A136840
• Numbers k such that k and k^2 use only the digits 0, 1, 4, 5 and 8.at n=13A136857
• Numbers k such that k and k^2 use only the digits 0, 1, 4, 7 and 8.at n=29A136864
• Numbers k such that k and k^2 use only the digits 0, 1, 4 and 8.at n=10A136866
• Number of nondecreasing integer sequences of length 42 with sum zero and sum of absolute values 2n.at n=21A158176
• a(n) = (10^n)^2 + 4*(10^n) + 1.at n=3A225810