20177

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 93.at n=18A020432
• Number of ways of numbering the vertices of a cube so sum of the 8 numbers is n.at n=18A039959
• Primes p from A031924 such that A052180(primepi(p)) = 17.at n=24A052234
• Primes of the form k^2 + 13.at n=25A138375
• Primes congruent to 58 mod 59.at n=33A142785
• Primes congruent to 47 mod 61.at n=37A142845
• 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, 0), (1, -1, -1), (1, 1, -1), (1, 1, 1)}.at n=8A149619
• Primes of the form 3n^2 + 5.at n=22A201478
• Primes of the form 6n^2 - 7.at n=21A201792
• Primes p such that 2*p + 47 is a square.at n=42A269788
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 878", based on the 5-celled von Neumann neighborhood.at n=7A273740
• Sum of first n Honaker primes.at n=14A276255
• Primes p such that 6p - 1 and 6p + 1 are twin primes and ((6p-1)^2 + (6p+1)^2) / 10 is prime.at n=16A283957
• Number of inseparable partitions of n; see Comments.at n=44A325535
• Integers which can be written in exactly three ways as sum of two distinct nonzero pentagonal numbers.at n=18A333013
• Primes that contain at least two different even digits and at least two different odd digits such that any permutation of the odd digits and any permutation of the even digits produces a prime. Permutations with leading 0's are disregarded; i.e., if permutations of even digits in a prime p produce a number with a leading 0 that is not prime, p is still in the sequence.at n=27A377564
• Prime numbersat n=2283