300000000

Appears in sequences

• Powers of 3 written in base 9.at n=17A004663
• Powers of 3 written in base 27.at n=25A004669
• Numbers k such that k^2 contains exactly 2 distinct digits.at n=44A016069
• a(n) is root of square starting with digit 9: first term of runs.at n=14A035076
• Expansion of (1-7x)/(1-10x).at n=9A093138
• 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=24A098408
• Length of the cycle for Lucas numbers mod 10^n.at n=8A114307
• a(n) is the minimal difference between two distinct n-digit numbers with property that when one of them is typed into a calculator and rotated 180 degrees, the other one is seen.at n=16A125521
• Numbers k such that k and k^2 use only the digits 0, 1, 3 and 9.at n=18A136853
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 7 and 9.at n=22A136895
• Numbers k such that k and k^2 use only the digits 0, 3, 4, 5 and 9.at n=33A136929
• Numbers k such that k and k^2 use only the digits 0, 3, 5, 7 and 9.at n=33A136940
• Numbers k such that k and k^2 use only the digits 0, 3, 5 and 9.at n=12A136942
• Numbers k such that k and k^2 use only the digits 0, 3, 7, 8 and 9.at n=21A136947
• Numbers k such that k^4 has exactly 3 different decimal digits.at n=21A155149
• Denominator of Bernoulli(n, 1/10).at n=8A158994
• Denominator of Bernoulli(n, -1/10).at n=8A158996
• Denominator of Bernoulli(n, -3/10).at n=8A159012
• Numbers k such that k^2 contains exactly 2 distinct digits and k^3 contains exactly 3 distinct digits.at n=13A247047
• Exponent of 2 modulo the prime A056807(n).at n=3A259867