2001002

Appears in sequences

• Numbers k such that k^2 contains only digits {0,4,9}, not ending with zero.at n=11A058443
• Palindromic primes in base 3 (written in base 3).at n=11A117698
• Sum of any three adjacent digits of n^2 is a square.at n=57A174397
• In base 3, 0, together with numbers of the form i00j00k00m00... where i = 1 or 2 and j,k,m,... are 0, 1, or 2.at n=39A261660
• Number of nX6 0..2 arrays with no element equal to more than one of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=7A281538