26893

Properties

Appears in sequences

• Where prime race 4m-1 vs. 4m+1 is tied.at n=9A007351
• Primes of form k^2 - 3.at n=28A028874
• Primes p such that the number of primes less than p equal to 1 mod 4 is one less than the number of primes less than p equal to 3 mod 4.at n=22A096448
• Fixed points for prime number permutation A108546.at n=16A108547
• Small-number statistic from the enumeration of domino tilings of a 5-pillow of order n.at n=17A112838
• Primes p such that 24*p-1, 24*p+1 and 30*p-1, 30*p+1 are twin primes.at n=6A138695
• In this sequence each prime ends a prime century. Place a 0 between the final two digits, and raise the 100s digit by 1, to form the first prime of the next century.at n=3A156083
• Prime p1 of consecutive primes p1, p2, where p2-p1=10, and p1, p2 are in different centuries.at n=28A160500
• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=10, k=-1 and l=1.at n=6A177203
• Numbers k such that 2^(k-1) == 1 + b*k (mod k^2), where b divides k-1.at n=18A186645
• Numbers k such that 2^(k-1) == 1 + b*k (mod k^2), where b divides k - 2^p for some integer p >= 0 and 2^p <= b.at n=37A186884
• Primes p such that the average of the fourth powers of primes up to p is an integer.at n=1A232869
• Smallest prime p such that p - floor(sqrt(p))^2 = n^2.at n=17A242991
• Triangle read by rows: T(n,k) is the number of bargraphs of semiperimeter n having k levels. A level in a bargraph is a maximal sequence of two or more adjacent horizontal steps; it is preceded and followed by either an up step or a down step.at n=44A273344
• Number of weird numbers (A006037) less than 2^n.at n=24A275487
• Primes p such that A001414(p^4-1) is the square of a prime.at n=1A342825
• Prime numbers followed by two consecutive numbers which are products of four distinct primes (or tetraprimes).at n=5A362578
• Prime numbersat n=2951