A227878 Primes occurring twice in A051701.

3, 19, 41, 43, 71, 83, 101, 109, 151, 167, 199, 227, 229, 257, 281, 283, 311, 313, 349, 383, 401, 443, 461, 463, 487, 503, 571, 601, 617, 641, 643, 677, 727, 757, 829, 857, 859, 881, 883, 911, 937, 941, 971, 1033, 1063, 1091, 1093, 1123, 1187, 1217, 1231

Offset

1,1

Comments

Consider five consecutive primes p1..p5: (p3 is a term of this sequence) iff (p2-p1 > p3-p2 and p5-p4 > p4-p3).

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Prog

(Haskell)
a227878 n = a227878_list !! (n-1)
a227878_list = f a051701_list where
   f (p:ps@(_:p':_)) = if p == p' then p : f ps else f ps

Crossrefs

Sequence in context: A114704 A167053 A131542 * A042371 A141644 A141170

Adjacent sequences: A227875 A227876 A227877 * A227879 A227880 A227881

Keyword

nonn

Author

Reinhard Zumkeller, Oct 25 2013

Status

approved