23038

Appears in sequences

• Parenthesized one way gives the powers of 2: (1), (2), (1+3), ..., another way the powers of 3: (1), (2+1), (3+6), ....at n=25A006895
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=35A031846
• Numbers k such that k*2^m-1 are composites for all exponents m in the range 0<=m<=k.at n=40A061154
• Numbers n such that phi(2n-1) = sigma(n).at n=43A067230
• Numbers n such that sigma(n)=phi(n*bigomega(n)-1).at n=35A067877
• Smallest initial value k that reaches 1 in n steps when iterating the map m -> rad(m)-1, where rad(m) is the squarefree kernel of m (A007947).at n=21A075426
• a(0) = 0, a(1) = 1 and for n >= 2, a(n) = floor(sqrt(2 * (a(n-2)^2 + a(n-1)^2))).at n=22A093332
• Triangle read by rows: T(n,m)=floor[(m/n)*row(n)].at n=24A152969
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 382", based on the 5-celled von Neumann neighborhood.at n=37A271541
• Positive integers that have exactly ten representations of the form 1 + p1 * (1 + p2* ... * (1 + p_j)...), where [p1, ..., p_j] is a (possibly empty) list of distinct primes.at n=25A317400