24593

Properties

Appears in sequences

• a(n) = [ (3rd elementary symmetric function of P(n))/(first elementary symmetric function of P(n)) ], where P(n) = {1, p(1), p(2), ..., p(n-1)}, where p(0) = 1.at n=15A024532
• a(n) = Sum(a(2i-1)*a(n-2i+1), i = 1,2,...,[ (n+2)/4 ]).at n=24A024965
• Number of primitive subsequences of {1, 2, ..., n}.at n=22A051026
• a(1) = 2, a(2) = 3, a(3) = 5 and a(n) = the smallest prime which is a linear combination of previous three terms with all coefficients >=1.at n=13A072536
• First occurrence prime gaps of the primes in sequence A002313 (Real primes with corresponding complex primes). a(0) = 2 with length of gap 3. For n>0 the size of the gap in the sequence is 4n, a(n) is the starting prime of the gap.at n=21A084160
• Balanced primes of order ten.at n=12A096702
• Prime numbers, isolated from neighboring primes by >16.at n=32A137875
• Primes expressed as the sum of square of digits of all primes.at n=31A181508
• Least prime in a string of exactly n consecutive primes all differing by 3-almost primes (A014612).at n=5A226768
• Primes, starting with a(1)=2, whose successive differences are increasing triangular numbers.at n=18A278139
• The first of two consecutive primes the sum of which is equal to the sum of two consecutive heptagonal numbers.at n=4A298466
• a(n) = (4*n^3 + 30*n^2 + 50*n)/3 + 1.at n=24A323218
• a(n) = numerator of Sum_{1 <= i < j <= d(n)} 1/(d_j - d_i), sum over ordered pairs of divisors of n, where d(n) is the number of divisors of n.at n=11A330077
• Prime numbersat n=2726