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A307733 Hexadecades with no primes. 1
83, 84, 110, 122, 155, 160, 186, 202, 205, 217, 234, 248, 252, 260, 269, 279, 283, 294, 302, 320, 335, 346, 350, 360, 369, 386, 400, 402, 406, 433, 454, 461, 485, 498, 508, 512, 521, 525, 530, 534, 549, 556, 561, 567, 590, 597, 598, 624, 626, 632 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers k with no primes between 16*k and 16*k+15 inclusive.

LINKS

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

MAPLE

q:= n-> not ormap(isprime, [$16*n..16*n+15]):

select(q, [$1..700])[];  # Alois P. Heinz, Aug 23 2019

PROG

(PARI) isok(n) = primepi(16*n+15) == primepi(16*n); \\ Michel Marcus, Aug 22 2019

(PARI) is(n)=precprime(16*n+15)<16*n \\ Charles R Greathouse IV, Apr 07 2020

CROSSREFS

Cf. A032352 (decades), A181098 (centuries).

Sequence in context: A031961 A108751 A256520 * A130286 A226380 A062677

Adjacent sequences:  A307730 A307731 A307732 * A307734 A307735 A307736

KEYWORD

nonn,changed

AUTHOR

Elizabeth Axoy, Aug 22 2019

STATUS

approved

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Last modified April 8 21:44 EDT 2020. Contains 333329 sequences. (Running on oeis4.)