30677

Properties

Appears in sequences

• Number of permutations of [n] with no strong fixed points.at n=8A052186
• Balanced primes of order seven.at n=27A096699
• Primes p such that googol - p is prime.at n=19A108252
• Eigentriangle based on A052186 (permutations without strong fixed points), row sums = n!at n=36A144108
• Eigentriangle based on A052186 (permutations without strong fixed points), row sums = n!at n=46A144108
• Triangle read by rows: T(n,k) is the number of permutations of [n] having k strong fixed points (0 <= k <= n).at n=36A145878
• Primes p such that continued fraction of (1 + sqrt(p))/2 has period 7: primes in A146332.at n=38A146352
• Triangle read by rows: T(n,k) is the number of permutations of [n] having k strong fixed blocks (see first comment for definition).at n=20A186373
• Numbers n such that the trinomial x^n-x-1 is irreducible over GF(3).at n=36A223938
• Number of partitions of n into parts <= phi(n), where phi is Euler's totient function (cf. A000010).at n=39A227296
• Primes formed from concatenation of PrimePi(n) and prime(n).at n=38A236551
• Non-palindromic balanced primes in base 16.at n=41A256090
• Primes of form n^2 + 28561.at n=8A256841
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 865", based on the 5-celled von Neumann neighborhood.at n=15A284301
• Primorial base emirps: prime numbers whose primorial base reversal is a different prime.at n=33A333425
• Primes p such that if q and r are the next two primes, 6*q-r, 6*q-p, 6*q+p and 6*q+r are all prime.at n=13A351636
• Least prime p such that there exist exactly n primes of the form q#-p (q# = product of primes <= q, namely primorial numbers (second definition)).at n=26A373726
• Prime numbersat n=3309