29021

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 97.at n=19A020436
• 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 30.at n=4A031618
• a(1) = 1, a(n) = prime equal to n-th partial sum of A073852.at n=13A073854
• Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <= 6 (i.e., when d = 2, 4 or 6) and forming pattern = [2, 4, 6]; short notation = [246] d-pattern.at n=34A078847
• Number of partitions of n such that the least part occurs exactly twice.at n=49A096373
• Number of partitions of n^3 into n distinct nonzero squares.at n=14A133102
• Primes of the form 2m*691 - 1.at n=5A134671
• Primes p2 such that p1^2 + p2^3 is an average of twin primes and p1 < p2 are consecutive primes.at n=28A138716
• Primes of the form 2n^2+14n+5.at n=20A154577
• Initial members of prime triples (p, p+2, p+6) for which also the sum 3p+8 is prime.at n=35A162001
• Primes p such that (p reversed)+ 8 is a square.at n=42A167470
• Primes such that applying "reverse and add" twice produces two more primes.at n=20A174402
• Primes p such that p + 2, p + 6, and the concatenation p (p+2) (p+6) is prime.at n=8A174858
• Cyclops Sophie-Germain primes.at n=15A183058
• Cyclops primes p such that 2p+1 is also a Cyclops prime.at n=7A183059
• Number of real singularities on a family of degree-3n algebraic surfaces.at n=13A200048
• Prime numbers p such that x^2 + x + p produces primes for x = 0..3 but not x = 4.at n=19A210362
• Lesser twin prime p such that p^2-p-2 is the average of a larger twin prime pair.at n=32A231652
• Smallest lesser of twin primes (A001359) with index n, or a(n)=0, if there are no such twin primes.at n=24A242807
• Primes p for which p^i - 4 is prime for i = 1, 3 and 5.at n=9A243818