143509

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 30.at n=18A031618
• First term of weak prime septet: p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2) < p(m+4)-p(m+3) < p(m+5)-p(m+4) < p(m+6)-p(m+5).at n=6A054834
• Primes p such that the sum of the squares of the digits of p plus p is the square of a prime.at n=5A225741
• a(n) = Sum_{i=0..n} digsum(i)^4, where digsum(i) = A007953(i).at n=42A231689
• Prime numbersat n=13302