80149

Properties

Appears in sequences

• Consider all ways of writing a number as p+2m^2 where p is 1 or a prime and m >= 0; sequence gives numbers that are expressible in at least 2 more ways than any smaller number.at n=29A016067
• 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 22.at n=24A031610
• Indices of primes in sequence defined by A(0) = 41, A(n) = 10*A(n-1) + 11 for n > 0.at n=9A101719
• Primes of the form 7n^2 + 6.at n=15A201607
• Primes p for which p^i + 4 is prime for i = 1, 3 and 5.at n=12A243780
• a(n) = Sum_{m=0..floor((n-1)/2)} prime((n-m)(n-m-1)/2+m+1).at n=41A249490
• Numbers k such that (598*10^k - 31)/9 is prime.at n=29A281991
• Prime numbersat n=7847