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A069639 Smallest composite k such that phi(k)>k*(1-1/n^2). 0
4, 25, 121, 289, 841, 1369, 2809, 4489, 6889, 10201, 16129, 22201, 29929, 38809, 51529, 66049, 85849, 109561, 134689, 160801, 196249, 237169, 292681, 332929, 398161, 458329, 537289, 619369, 727609, 822649, 935089, 1062961, 1190281 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..33.

FORMULA

a(n)=nextprime(n^2)^2=A007918(n^2)^2

CROSSREFS

Cf. A069549.

Sequence in context: A110051 A273023 A013187 * A013582 A260373 A175733

Adjacent sequences:  A069636 A069637 A069638 * A069640 A069641 A069642

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Apr 21 2002

STATUS

approved

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Last modified October 20 04:37 EDT 2018. Contains 316378 sequences. (Running on oeis4.)