26879

Properties

Appears in sequences

• Number of restricted solid partitions of n.at n=20A002974
• Where the prime race 4k-1 vs. 4k+1 changes leader.at n=2A007350
• Smaller of twin primes whose middle term is a multiple of A002110(4)=210.at n=21A060230
• Primes p such that 7 is the largest of all prime factors of the numbers between p and the next prime (cf. A052248).at n=18A080186
• Prime partial sums of the odd-indexed primes.at n=10A096208
• Odd primes p such that the number of primes less than p that are congruent to 1 (mod 4) is equal to the number of primes less than p that are congruent to 3 (mod 4).at n=7A096447
• Primes p such that 2*p+1 and ((2*p+1)^2 + 1)/2 = p^2 + (p+1)^2 are primes.at n=30A098717
• Primes with digit sum = 32.at n=19A106768
• Fixed points for prime number permutation A108546.at n=13A108547
• Lesser of twin primes p1 such that p1+(p2^2-p1^2) and p2+(p2^2-p1^2) are prime numbers.at n=33A174922
• a(n) is the least integer such that the iterated modulus chain m_1=mod(a(n),m),m_2=mod(a(n),m_1),m_3=mod(a(n),m_2),..., m_n= (0 or 1) reaches a length n. The companion value m, associated to a(n), is given in A177968.at n=30A177967
• Primes p such that q*p+-Mod(p,q) are primes, for q=7.at n=36A178387
• Number of (w,x,y,z) with all terms in {1,...,n} and w*x+y*z>n^2.at n=23A212136
• Numbers n such that the digits of antisigma(n) end in sigma(n).at n=4A248819
• Numerator of fraction equal to the finite continued fraction [2,7,1,8,2,...] (first n digits of e).at n=7A249944
• Numbers m such that antisigma(m) contains sigma(m) as a substring.at n=8A258413
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 533", based on the 5-celled von Neumann neighborhood.at n=15A288980
• Primes of the form k!8-1, where k!8 is the octuple factorial number (A114800).at n=10A289756
• Prime numbersat n=2948