1414213

Appears in sequences

• Decimal expansion of sqrt(2) truncated to n places.at n=6A011547
• a(n) is the index of the smallest triangular number containing exactly n 9's.at n=7A048364
• a(n) = the largest integer whose square has n digits and first digit 1.at n=12A083377
• Index of largest triangular number with n digits.at n=11A095863
• Numbers k such that the k-th triangular number contains only digits {1,7,9}.at n=8A119149