348161

Appears in sequences

• Values of k such that the total number of 1's in the binary expansions of the first k integers is a multiple of k.at n=31A095376
• Numbers k such that sigma(k)*k is a triangular number.at n=36A115909
• Sarrus numbers that become prime when two is added.at n=16A137198
• a(n) = (n-2)^4 - a(n-1) - a(n-2), with a(1) = a(2) = 0.at n=32A152729
• Pseudoprimes divisible by a smaller pseudoprime.at n=23A215150
• Fermat pseudoprimes to base 2 with three prime factors divisible by a smaller Fermat pseudoprime to base 2.at n=7A215944
• Fermat pseudoprimes to base 2 of the form (n^2 + 2*n)/3.at n=15A216170
• Fermat pseudoprimes to base 2 that can be written as p^2*n - p*n + p, where p is also a Fermat pseudoprime to base 2 and n is a positive integer.at n=0A217835
• Pseudoprimes to a twin prime criterion of Aebi and Cairns.at n=17A224695
• Numbers that are both Poulet and Proth.at n=6A242880
• Composite integers n such that n-1 divided by the binary period of 1/n (=A007733(n)) equals an integral power of 2.at n=1A243050
• Octagonal numbers (A000567) that are the sum of eleven consecutive octagonal numbers.at n=1A258131
• a(n) = n*(3*n - 2)*(9*n^2 - 6*n - 2).at n=11A264892
• Fermat pseudoprimes to base 2 that are octagonal.at n=15A321868