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A195377 2.5-gap primes: Prime p is a term if there is no prime between 2.5*p and 2.5*q, where q is the next prime after p. 4
127, 197, 281, 311, 347, 431, 613, 659, 673, 739, 877, 991, 1049, 1229, 1277, 1289, 1367, 1481, 1579, 1613, 1667, 1721, 1787, 1877, 1907, 2027, 2081, 2087, 2141, 2203, 2213, 2237, 2239, 2269, 2287, 2309, 2377, 2383, 2473, 2657, 2689, 2707, 2749, 2767, 2801 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

MATHEMATICA

Select[Prime[Range[500]], PrimePi[5*NextPrime[#]/2] == PrimePi[5*#/2] &] (* T. D. Noe, Sep 20 2011 *)

CROSSREFS

Cf. A195270, A195271, A195325, A194658, A164294.

Sequence in context: A107380 A282793 A180539 * A142090 A095730 A325078

Adjacent sequences:  A195374 A195375 A195376 * A195378 A195379 A195380

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Sep 17 2011

STATUS

approved

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Last modified September 23 04:01 EDT 2021. Contains 347609 sequences. (Running on oeis4.)