18701

Properties

Appears in sequences

• Numbers that are the sum of 5 positive 7th powers.at n=27A003372
• Balanced primes of order four.at n=17A082079
• Primes such that successive differences are distinct palindromes.at n=42A087582
• Primes in the sequence A003294 of certain fourth powers bases.at n=12A134820
• Primes congruent to 45 mod 53.at n=39A142575
• Primes congruent to 57 mod 59.at n=36A142784
• Primes congruent to 35 mod 61.at n=37A142833
• a(n) = Sum_{k=1..n} k*sigma(k).at n=31A143128
• Numbers n with property that n^2 is a concatenation of three 3-digit primes.at n=29A153139
• Prime numbers q of primitive Pythagorean triangles such that perimeters are averages of twin prime pairs, p+1=q(prime), a=q^2-p^2, c=q^2+p^2, b=2*p*q, ar=a*b/2; s=a+b+c, s-+1 are primes.at n=30A155187
• Number of binary strings of length n with no substrings equal to 0000 0010 or 1010.at n=14A164422
• Noncomposite numbers in the southern ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.at n=18A168027
• Primes of the form x^2 + 29*(x+1)^2.at n=4A176695
• Larger of emirp pairs whose digital sums are also emirps (A178091).at n=33A178093
• Central term of nine successive primes whose average is a prime.at n=33A180457
• 1/8 the number of (n+1)X4 0..3 arrays with all 2X2 subblock sums the same.at n=5A184023
• 1/8 the number of (n+1)X7 0..3 arrays with all 2X2 subblock sums the same.at n=2A184026
• T(n,k)=1/8 the number of (n+1)X(k+1) 0..3 arrays with all 2X2 subblock sums the same.at n=30A184029
• T(n,k)=1/8 the number of (n+1)X(k+1) 0..3 arrays with all 2X2 subblock sums the same.at n=33A184029
• Number of length 3+1 0..n arrays with the sum of the minimum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=19A250420