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

Author

L. Edson Jeffery, Dec 29 2014

Keywords

• nonn

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

Crossrefs

Cf. A098550.

Cf. A010051, A098551, A251239, A251541.

Programs

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