87277

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 20.at n=23A031608
• Prime means of 12 horizontal, vertical and main diagonal sums associated with primes in A094458.at n=31A094459
• Primes p such that (p reversed) +6 is a square.at n=28A167472
• Number of (w,x,y,z) with all terms in {1,...,n} and w <= harmonic mean of {x,y,z}.at n=22A212104
• Primes having only {2, 7, 8} as digits.at n=34A385789
• Prime numbersat n=8474