5242877

Properties

Appears in sequences

• Let u(1)=u(2)=1, u(3)=n, u(k) = (1/2)*abs(2*u(k-1) -u(k-2)-u(k-3)); sequence gives values of n such that Sum_{k>=1} u(k) is an integer.at n=40A078113
• Smallest prime obtained as a sum of n terms of a geometric progression + the common ratio, or 0 if no such terms exists. Smallest prime of the form (a +ar +ar^2 + ar^3 +... ) + r.at n=19A088121
• Smallest prime p such that the sum of it and the following prime has n prime factors including multiplicity, or 0 if no such prime exists.at n=21A105418
• The number of edges on a piece of paper that has been folded n times (see comments for more precise definition).at n=39A133257
• Expansion of (1 - x + 3*x^2)/((1-x)*(1-2*x)).at n=21A154117
• Primes in the chain of repeated application of x->2*x+3, starting at x=2.at n=9A172156
• Primes in A154117.at n=10A173769
• Least prime p such that q = (3+p)/2^n is prime.at n=20A248526
• a(n) is the least prime p such that the 2-adic valuation of q^2-p^2 is n, where q is the next prime after p, or 0 if there is no such p.at n=22A340116
• a(n) is the least prime p such that the 2-adic valuation of p+q is n, where q is the next prime after p, or 0 if there is no such p.at n=21A340117
• a(n) is the least prime p such that the binary expansions of p and of the next prime q > p differ at exactly n positions, and p and q have the same binary length.at n=19A374179
• Prime numbersat n=364195