50175

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=18A069186
• a(0) = 4; a(n) = a(n-1)^2 - 1.at n=3A139244
• a(n) = 64*n^2 - 1.at n=27A158684
• 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=39A161460
• Number of n X 5 1..3 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in increasing order.at n=5A166825
• 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=26A171061
• 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=27A171062
• a(n) = (n^2-1)^2-1.at n=15A178392
• Least common multiple of 7*n+1 and 7*n-1.at n=32A282286
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 179", based on the 5-celled von Neumann neighborhood.at n=30A286206
• Bases in which 7 is a unique-period prime.at n=49A306075