30491

Properties

Appears in sequences

• Primes p such that 11 is the largest of all prime factors of the numbers between p and the next prime (cf. A052248).at n=24A080187
• Record-setting differences between adjacent elements of the Mian-Chowla sequence variant A058335.at n=45A080931
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (1, -1, -1), (1, -1, 1), (1, 1, 0)}.at n=9A149209
• Emirps of the form k^2 + k + 41.at n=28A155953
• a(n) = 28*n^2 - 1.at n=32A158554
• Lesser of twin primes p1 such that p1+(p2^2-p1^2) and p2+(p2^2-p1^2) are prime numbers.at n=38A174922
• Larger of emirp pairs whose digital sums are also emirps (A178091).at n=36A178093
• Primes of the form 7n^2 - 1.at n=6A201793
• Primes p with same last two digits as k, where prime(k) = p.at n=33A232102
• Primes which become cubes when the digits are rotated once to the left.at n=6A234929
• Triangle T(n,k) read by rows: T(n,k) is the number of compositions of n with k parts p at position p (fixed points), n>=0, 0<=k<=A003056(n).at n=68A238350
• Fourth prime p such that (p+n)^2+n is prime but (p+j)^2+j is not prime for all 0<j<n.at n=33A238676
• Number of compositions of n having exactly one fixed point.at n=16A240736
• Lexicographically earliest strictly increasing sequence of primes whose partial products lie between noncomposite numbers.at n=16A359939
• Prime numbersat n=3291