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A217198 A sequence of odd primes p such that 2p-1 is prime and no p is equal to any 2q-1 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 (list; graph; refs; listen; history; text; internal format)
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), 181-184.

A. Schinzel and Andrzej Wakulicz, Sur l'équation phi(x+k)=phi(x). II. Acta Arith. 5 1959 425-426.

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

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Last modified February 24 07:19 EST 2020. Contains 332199 sequences. (Running on oeis4.)