28151

Properties

Appears in sequences

• Numerators of continued fraction convergents to sqrt(356).at n=9A041674
• Let G(t) be the set of numbers between 2^(t-1) and 2^t-1, inclusive. There is a unique number a(t) in G(t) so that the denominator of the a(t)-th partial sum of the double harmonic series is divisible by smaller 2-powers than its neighbors.at n=13A079403
• Numbers n such that n and the four successive integers produce primes if substituted for x in the polynomial 5x^2+5x+1. See A090562, A090563. Terms show that longer similar chains also exist.at n=16A090100
• Slowest increasing sequence in which a(n) is a prime closest to the sum of all previous terms.at n=15A109277
• Sequence of Chen primes of the form (x*n+1)*(y*n+1)-2 in the order generated by A112229.at n=22A112230
• Father primes of order 11.at n=26A136080
• Primes p such that 42*p-1, 42*p+1 and 48*p-1, 48*p+1 are twin primes.at n=10A138697
• Primes p such that continued fraction of (1 + sqrt(p))/2 has period 12 : primes in A146336.at n=21A146357
• a(n) = 529*n^2 - 746*n + 263.at n=7A156842
• Primes p such that all the digits needed to write the consecutive Primes from 2 to p fill exactly a square (no holes, no overlaps).at n=33A158024
• Primes p such that p^3-p-+1 are twin primes.at n=32A158295
• Smallest primes p = p(k) with (p(k)+p(k+1)+p(k+2))/15 an integer.at n=25A168556
• Smallest weak prime in base n.at n=4A186995
• Primes p such that p^2 - p - 1, p^3 - p - 1 and p^4 - p - 1 are all prime.at n=3A236173
• a(n) is the smallest prime that becomes composite if any single digit of its base-n expansion is changed to a different digit (but not to zero).at n=4A323745
• Numbers m such that A366470(m) > A366470(m-1).at n=13A366864
• a(n) = least prime > (5/3)*a(n - 1)*a(n - 3)/a(n - 2), with a(1) = 2, a(2) = 3, a(3) = 5.at n=34A377544
• Consecutive states of the linear congruential pseudo-random number generator (257*s + 41) mod 2^16 when started at s=1.at n=6A384961
• Numbers k such that (28^k - 5^k)/23 is prime.at n=6A392145
• Prime numbersat n=3070