300001

Appears in sequences

• Numbers k such that k^2+k+7 is a palindrome.at n=15A027722
• Numbers whose square contains the same digit more than 2/3 of the time and does not end in 0.at n=14A039820
• Smallest multiple of n with digit sum = 4, or 0 if no such number exists, e.g. a(3k)= 0.at n=46A069523
• a(n) = sqrt(A077204(n)).at n=10A077205
• a(1) = 1; for n>1, a(n) = smallest number > a(n-1) such that last digit of a(n-1) + first digit of a(n) = 3.at n=16A098408
• Lexicographically earliest increasing sequence whose k-th digit is the absolute difference between the two digits touching the k-th comma.at n=19A102663
• a(n) = 3*10^n + 1.at n=5A199683
• Irregular triangle read by rows: row n lists all of the distinct derivable strings in the MIU formal system that are n characters long.at n=21A369173