23281

Appears in sequences

• Pseudoprimes to base 78.at n=40A020206
• Strong pseudoprimes to base 72.at n=16A020298
• Strong pseudoprimes to base 73.at n=11A020299
• Strong pseudoprimes to base 76.at n=20A020302
• Strong pseudoprimes to base 80.at n=17A020306
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 80 ones.at n=27A031848
• Pseudo-random numbers: MS C 6.0 version.at n=12A084275
• Sum of first n 6-almost primes.at n=38A086052
• Position of 3^n in A051037 (5-smooth numbers).at n=49A188426
• a(n) = Sum_{k=0..n} binomial(n,k)^3 * 6^k.at n=4A216698
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 841", based on the 5-celled von Neumann neighborhood.at n=27A273685
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Sum_{j=0..n} k^j * binomial(n,j)^3.at n=59A336163
• Centered pentagonal numbers which are squarefree semiprimes.at n=33A381043
• Centered pentagonal numbers which are semiprimes.at n=34A382132