50387

Properties

Appears in sequences

• Least k such that the first k terms of the Kolakoski sequence (A000002) contain n more 2's than 1's.at n=34A025503
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-4)/2.at n=18A048060
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n+2)/3.at n=18A048071
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n+3)/3.at n=18A048082
• Integers k for which {prime(1), prime(2), ..., prime(k)} (mod 4) is biased towards 1.at n=8A096628
• a(n) = C(n,7)-1.at n=12A124090
• Primes from merging of 5 successive digits in decimal expansion of sqrt(2).at n=9A198165
• a(n) = index where A088568 (or equally A294448) first reaches or exceeds n in magnitude.at n=34A294449
• Prime numbersat n=5172