30211

Properties

Appears in sequences

• Number of bipartite partitions.at n=15A002765
• Primes whose decimal representation is a valid number in base 5 and interpreted as such is again a prime.at n=43A090708
• Smallest primes p = p(k) with (p(k)+p(k+1)+p(k+2))/15 an integer.at n=28A168556
• Incorrect duplicate of A062337.at n=30A176252
• Primes p such that p^6 - p^5 + 1 and p^6 - p^5 - 1 are both primes.at n=6A243522
• Primes p such that 10p + 1, 100p + 1 and 1000p + 1 are also primes.at n=32A243962
• Number of compositions of n where the difference between largest and smallest parts equals five.at n=14A323122
• The prime factorization of abs(E(2k)) for k >= 2, E(k) the k-th Euler number. Factors sorted by size with the smallest factor negated. a(n) = -1 by convention for n = 1, 2.at n=37A326726
• Numbers that are palindromes in primorial base.at n=45A333423
• Primes that are palindromes in primorial base.at n=17A333424
• Discriminants of imaginary quadratic fields with class number 39 (negated).at n=34A351677
• Number of vertices formed in a hexagon by straight line segments when connecting the n-1 points between each corner that divide each edge into n equal parts to the n-1 points on the edge on the opposite side of the hexagon.at n=10A367663
• Prime numbersat n=3268