23029

Properties

Appears in sequences

• Coordination sequence for sigma-CrFe, Position Xa.at n=38A009962
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 13.at n=17A031601
• Numbers n such that (256^n + 1)/257 is prime.at n=2A127317
• Numbers k such that (17^k - 3^k)/14 is prime.at n=4A128031
• Primes congruent to 32 mod 61.at n=37A142830
• Primes p of the form 4*k+1 for which s=26 is the least positive integer such that s*p-(floor(sqrt(s*p)))^2 is a square.at n=33A145050
• Number of ways that a 1 X n rectangular tile T, marked into n unit squares, can be surrounded by one layer of copies of itself laid in the plane grid generated by the units of T. Ways that differ by rotation or reflection are not counted as different. The surrounded tile is the exact surrounded region.at n=17A159294
• Noncomposite numbers in the northern ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.at n=15A168023
• Number of partitions of n containing a clique of size 8.at n=45A183565
• Right-truncatable, reversible primes in base 16.at n=32A238851
• Number of partitions p of n such that neither floor(mean(p)) nor ceiling(mean(p)) is a part.at n=45A241343
• Partial sums of A299894.at n=36A299895
• First of three consecutive primes p,q,r such that r*(p+q) + p*q and r*(p+q) - p*q are prime.at n=37A358382
• Prime numbersat n=2570