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A038757 Earliest sequence where a(a(n))=4^n. 2
2, 4, 5, 16, 64, 7, 4096, 9, 65536, 11, 1048576, 13, 16777216, 15, 268435456, 256, 18, 17179869184, 20, 274877906944, 22, 4398046511104, 24, 70368744177664, 26, 1125899906842624, 28, 18014398509481984, 30, 288230376151711744, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
a(7)=a(a(6))=4^6=4096
CROSSREFS
Sequence in context: A056406 A250545 A070917 * A062549 A169602 A092051
KEYWORD
nonn
AUTHOR
Henry Bottomley, May 03 2000
STATUS
approved

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Last modified May 21 05:34 EDT 2024. Contains 372728 sequences. (Running on oeis4.)