18329

Properties

Appears in sequences

• Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer.at n=20A004787
• Primes p such that p, p+12, p+24 are consecutive primes.at n=14A052188
• a(n) is smallest prime > 7*a(n-1), a(1) = 7.at n=4A065542
• Ordered hypotenuses of primitive Pythagorean triangles having legs that add up to a square.at n=19A088319
• Primes congruent to 44 mod 53.at n=39A142574
• Primes congruent to 39 mod 59.at n=34A142766
• Primes p such that continued fraction of (1 + sqrt(p))/2 has period 3.at n=43A146348
• a(n) = 169*n^2 + 140*n + 29.at n=10A156640
• Positive numbers y such that y^2 is of the form x^2+(x+79)^2 with integer x.at n=11A159758
• Number of nX3 1..2 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order.at n=25A166781
• Primes p such that the period of the continued fraction of (1-sqrt(p))/2 has length 3 and p is not of the form k^2+1.at n=19A188136
• Least prime p such that all ten base-10 digits have prime counts in (p^prime(n))*(q^prime(n+1)), where q is the next prime after p.at n=0A217049
• Least prime p such that pi(p*n)^2 + 1 = prime(q*n) for some prime q.at n=20A260219
• Number of Schur rings over Z_{7^n}.at n=6A270787
• a(n) = n^6 + 5*n^5 + 19*n^4 + 44*n^3 + 72*n^2 + 69*n + 5.at n=4A270870
• Numbers k such that 6*10^k + 73 is prime.at n=23A285937
• Where the prime race among 9k+1, ..., 9k+8 changes leader.at n=42A297407
• Primes p such that A001175(p) = (p-1)/4.at n=37A308789
• Array T(n,k) of number of Schur rings over Z_{p^n} where n>=1 for p odd and k-th prime (by descending antidiagonals).at n=33A320948
• Array T(n,k) of number of Schur rings over Z_{p^n} where n>=1 for p odd and k-th prime (by descending antidiagonals).at n=41A320948