28223

Appears in sequences

• Numbers n such that core(n)=floor(sqrt(n)), where core(x)=A007913(x) is the squarefree part of x and floor(sqrt(x))=A000196(x).at n=15A069186
• a(n) = 36n^2 - 1.at n=27A136017
• a(n) = 784*n - 1.at n=35A158399
• a(n) = 64*n^2 - 1.at n=20A158684
• Positive numbers y such that y^2 is of the form x^2+(x+167)^2 with integer x.at n=10A159777
• Positive integers k such that there is no m different from k where both d(k) = d(m) and d(k+1) = d(m+1), where d(k) is the number of positive divisors of k.at n=35A161460
• Record numbers of A171063 nonzero period n solutions of x(i)=(x(i-1)+x(i-2)) mod m, as encountered in (n=1,m=1; n=1,m=2; n=2,m=1) antidiagonal order.at n=22A171061
• Record numbers of A171063 nonzero period n solutions of x(i)=(x(i-1)+x(i-2)) mod m, as encountered in (n=1,m=1; n=2,m=1; n=1,m=2) antidiagonal order.at n=23A171062
• a(n) = (n^2-1)^2-1.at n=13A178392
• Increasing a(n)is the smallest number of the form p^a*q^b, where a,b are positive integers and p < q are odd primes such that max( p^a, q^b)/min( p^a, q^b) <= 1 + 2/prime(n).at n=21A229108
• Product between n-th prime and next perfect square.at n=38A229497
• Expansion of 1/(1 - Sum_{k>=2} floor(1/omega(2*k-1))*x^(2*k-1)), where omega() is the number of distinct prime factors (A001221).at n=43A280200
• Least common multiple of 7*n+1 and 7*n-1.at n=24A282286
• Numbers k such that k, k+2, k+4 are of the form p^2*q where p and q are distinct primes.at n=5A308735
• Numbers of the form 16n^2 + 32n + 15 for which the central region of its symmetric representation of sigma consists of two subparts of sizes 4n+7 and 4n+1, n>=0.at n=35A335574
• Long leg of the only primitive Pythagorean triple whose inradius is the n-th odd prime and whose short leg is an even number.at n=37A367335