27117

Appears in sequences

• Molien series for group Gamma_{3,0}(2).at n=24A027632
• Least x = a(n) such that sum of common prime divisors (without multiplicity) of sigma(x) and phi(x) equals n, or 0 if such number (apparently) does not exist.at n=28A082056
• Slowest increasing sequence that starts with 2 and has property that multiplying two consecutive terms gives a number which does not share a digit with either of the two terms.at n=47A129513
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 397", based on the 5-celled von Neumann neighborhood.at n=33A271691
• Numbers k whose binary expansion is a substring of the binary expansion of binomial(k,2).at n=44A356537
• Numbers k such that k - A067666(k) is a square.at n=47A386304