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A124190 a(n) is largest prime < 4*a(n-1). 1
2, 7, 23, 89, 353, 1409, 5623, 22483, 89923, 359663, 1438643, 5754571, 23018273, 92073083, 368292317, 1473169213, 5892676849, 23570707387, 94282829533, 377131318127, 1508525272477, 6034101089897, 24136404359569, 96545617438253 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Artur Jasinski, Dec 16 2006, Table of n, a(n) for n = 1..40

CROSSREFS

Cf. A006902, A040016, A120031-A120040.

Sequence in context: A001338 A150341 A150342 * A176578 A047062 A150343

Adjacent sequences:  A124187 A124188 A124189 * A124191 A124192 A124193

KEYWORD

nonn

AUTHOR

Artur Jasinski, Dec 16 2006

STATUS

approved

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Last modified August 23 13:57 EDT 2019. Contains 326229 sequences. (Running on oeis4.)