91807

Properties

Appears in sequences

• Primes whose consecutive digits differ by 7 or 8.at n=20A048419
• n times n+5 gives the concatenation of two numbers m and m-5.at n=2A116255
• 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), (0, 1, 1), (1, 0, 1), (1, 1, 0)}.at n=8A151146
• Lesser of a pair (p,p+4) of cousin primes whose arithmetic mean p+2 is a square number.at n=8A176130
• Primes of the form 9n^2 - 2.at n=20A201860
• Primes p such that (p+nextprime(p))/2 is a perfect square.at n=37A225195
• Lesser of consecutive primes whose average is a perfect power.at n=40A242380
• Prime p such that sqrt(p+2) is semiprime (A001358).at n=28A257933
• Expansion of Sum_{k>=0} x^(k*(k+1)/2) * Product_{j=1..k} (1 + x^j)^j.at n=54A306733
• Number of regions in a polygon whose boundary consists of n+2 equally spaced points around the arc of a semicircle. See Comments for precise definition.at n=37A333643
• Primes p such that q = p mod A001414(p-1) = p mod A001414(p+1) is prime.at n=42A339182
• Primes p such that 24*p is the difference of two squares of primes in three different ways.at n=11A358313
• Prime numbersat n=8870