

A217198


A sequence of odd primes p such that 2p1 is prime and no p is equal to any 2q1 with q in the sequence.


1



3, 7, 31, 37, 97, 139, 157, 199, 211, 229, 271, 307, 331, 337, 367, 379, 439, 499, 547, 577, 601, 607, 619, 691, 727, 811
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OFFSET

1,1


COMMENTS

Sequence used in conjunction with A001259 in the referenced articles.
It is not clear that this sequence is correct  it certainly does not match the title. See A217199 for the correct version.  T. D. Noe, Sep 28 2012


LINKS

Table of n, a(n) for n=1..26.
A. Schinzel and Andrzej Wakulicz, Sur l'équation phi(x+k)=phi(x), I., Acta Arith. 4 (1958), 181184.
A. Schinzel and Andrzej Wakulicz, Sur l'équation phi(x+k)=phi(x). II. Acta Arith. 5 1959 425426.


CROSSREFS

Cf. A001259, A110581, A217199.
Sequence in context: A138862 A080173 A023266 * A110581 A128436 A213899
Adjacent sequences: A217195 A217196 A217197 * A217199 A217200 A217201


KEYWORD

nonn


AUTHOR

Michel Marcus, Sep 27 2012


STATUS

approved



