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A090557 a(n) = phi(A090556(n)). 2
1, 1, 2, 2, 4, 4, 4, 4, 12, 12, 12, 12, 24, 24, 24, 24, 24, 48, 96, 96, 96, 192, 192, 192, 192, 192, 192, 192, 192, 192, 192, 384, 384, 384, 384, 384, 768, 768, 768, 768, 768, 768, 768, 1536, 1536, 1536, 1536, 1536, 1536, 1536, 1536, 3072, 3072, 3072, 3072, 3072 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Starting at n=9, all known terms are of the form 3*2^k. - Ivan Neretin, May 01 2016

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..308

MATHEMATICA

EulerPhi@ NestList[Function[n, SelectFirst[Range[n + 1, 10^4], Divisible[EulerPhi@ #, EulerPhi@ n] &]], 1, 55] (* Michael De Vlieger, May 01 2016, Version 10 *)

CROSSREFS

Cf. A014573, A090556.

Sequence in context: A265529 A292597 A101656 * A230875 A035660 A115367

Adjacent sequences:  A090554 A090555 A090556 * A090558 A090559 A090560

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Dec 10 2003

EXTENSIONS

More terms from David Wasserman, Jan 04 2006

Missing term a(1) prepended by Ivan Neretin, May 01 2016

STATUS

approved

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Last modified February 19 08:54 EST 2018. Contains 299330 sequences. (Running on oeis4.)