A253297 Primes p for which some multiple k*p > 2*p appears before p does in A098550.

5, 7, 13, 17, 23, 29, 41, 67, 83, 97

Offset

1,1

Comments

It is conjectured (see A098550) that there are no more terms of the sequence.

Corresponding indices in A098550 are {9, 15, 23, 30, 51, 61, 87, 142, 175, 204}; indices in A000040 are {3, 4, 6, 7, 9, 10, 13, 19, 23, 25}.

A098550(A098551(a(n)) - 2) / a(n) > 2. - Reinhard Zumkeller, Dec 30 2014

Links

Table of n, a(n) for n=1..10.

Prog

(Haskell)
a253297 n = a253297_list !! (n-1)
a253297_list = f a098550_list where
   f (u:vs@(_:v:_)) = if a010051' v == 1 && div u v > 2
                         then v : f vs else f vs
-- Reinhard Zumkeller, Dec 30 2014

Crossrefs

Cf. A098550.

Cf. A010051, A098551, A251239, A251541.

Sequence in context: A216690 A095283 A317543 * A163385 A368277 A358313

Adjacent sequences: A253294 A253295 A253296 * A253298 A253299 A253300

Keyword

nonn

Author

L. Edson Jeffery, Dec 29 2014

Status

approved