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A065605 The (3^n)-th composite number. 1
4, 8, 16, 40, 111, 306, 882, 2563, 7513, 22170, 65602, 194695, 578949, 1724117, 5140568, 15340177, 45811041, 136886318, 409221920, 1223856725, 3661401440, 10956876415, 32796782398, 98189738332, 294021666926, 880564233896 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 0..40

MATHEMATICA

Composite[n_Integer] := Block[ {k = n + PrimePi[n] + 1 }, While[ k != n + PrimePi[k] + 1, k = n + PrimePi[k] + 1]; Return[ k ]]; Table[ Composite[3^n], {n, 0, 25} ]

CROSSREFS

Sequence in context: A306621 A144687 A278377 * A065978 A077447 A337783

Adjacent sequences:  A065602 A065603 A065604 * A065606 A065607 A065608

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Nov 27 2001

STATUS

approved

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Last modified September 28 06:05 EDT 2021. Contains 347703 sequences. (Running on oeis4.)