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A065606 The (7^n)-th composite number. 0
4, 14, 69, 426, 2811, 18964, 129796, 894425, 6189788, 42955634, 298658894, 2079246204, 14489671674, 101048453166, 705093892472, 4922191483150, 34373676895999, 240115703266097, 1677722277599685, 11724848294191033, 81953661525423276, 572918021989157017 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..21.

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[7^n], {n, 0, 16} ]

CROSSREFS

Sequence in context: A274804 A294222 A005501 * A049372 A050549 A222980

Adjacent sequences:  A065603 A065604 A065605 * A065607 A065608 A065609

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Nov 27 2001

EXTENSIONS

Corrected and extended by Chai Wah Wu, Apr 20 2018

STATUS

approved

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Last modified September 18 18:40 EDT 2021. Contains 347533 sequences. (Running on oeis4.)