27331

Appears in sequences

• Number of series-reduced star graphs with n edges.at n=11A002935
• Number of ordered quadruples of integers from [ 1,n ] with no common factors between triples.at n=30A015635
• Strong pseudoprimes to base 46.at n=26A020272
• Strong pseudoprimes to base 59.at n=22A020285
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 39 ones.at n=4A031807
• n-th 4k+1 prime times n-th 4k-1 prime.at n=18A048630
• Non-palindromic numbers such that the two largest proper divisors are palindromes having at least two digits and no other divisor is a palindrome with at least two digits.at n=21A074889
• a(n) = sum of absolute values of coefficients of (1+x-3x^2)^n.at n=7A084615
• a(n) = Sum_{i=0..n} i*L(i), where L = A000032.at n=14A097039
• Least k such that 10^n + k is a Sophie Germain prime and the lesser of a twin prime pair.at n=21A118580
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (0, 0, 1), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.at n=8A150212
• A musically inspired Titius-Bode-like sequence based on the geometric division of 4- and 5-dimensional space: Z_(n+1) = 3 * (C(n-1, 0) + C(n-1, 1) + C(n-1, 2) + C(n-1, 3) + C(n-1, 4) + C(n-1, 5)*A059620(n+6)) + 4.at n=23A209257
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+5x+5y>0.at n=19A211627
• Quasi-Carmichael numbers to exactly two bases.at n=38A257752
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 115", based on the 5-celled von Neumann neighborhood.at n=33A270183
• Numbers such that the sum of the reverse of their aliquot parts is equal to the reverse of the sum of their aliquot parts.at n=31A278948
• Numbers k such that k!6 + 16 is prime, where k!6 is the sextuple factorial number (A085158 ).at n=34A288444
• Least positive integer m relatively prime to n such that phi(m*n) = phi(m)*phi(n) is a fourth power, where phi is Euler's totient function (A000010).at n=30A334350
• Number of dominating sets in the n-dipyramidal graph.at n=12A347503
• Consecutive states of the linear congruential pseudo-random number generator 20403*s mod 2^15 when started at s=1.at n=13A384196