43524

Appears in sequences

• Starting index of a string of exactly 4 consecutive equal digits in decimal expansion of Pi.at n=30A049520
• Number of right isosceles triangles that can be formed from the n^2 points of n X n grid of points (or geoboard).at n=17A187452
• Number of -n..n arrays x(0..2) of 3 elements with zeroth through 2nd differences all nonzero.at n=17A199944
• a(1) = 1, a(n) = smallest positive number not yet in the sequence such that the concatenation of a(n-1) and a(n) is a square.at n=17A264770
• a(1) = 11, a(n) = smallest number > a(n-1) such that the concatenation of a(n-1) and a(n) is a square.at n=7A265151
• (1+e)-sigma amicable numbers.at n=18A274116
• Lesser of recursive amicable numbers pair: numbers m < k such that m = s(k) and k = s(m), where s(k) = A333926(k) - k is the sum of proper recursive divisors of k.at n=9A333929