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A181662 a(n) = the smallest positive integral multiple of 2^n not in the range of the Euler phi function, or -1 if no such multiple exists. 0
3, 14, 68, 152, 304, 608, 1984, 3968, 12032, 24064, 48128, 96256, 192512, 385024, 770048, 1540096, 3080192, 6160384, 12320768, 24641536, 49283072, 98566144, 197132288, 394264576, 788529152, 1577058304, 3154116608, 6308233216, 12616466432, 25232932864, 50465865728, 100931731456 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

David Harden, Posting to Sequence Fans Mailing List, Sep 19 2010

LINKS

Table of n, a(n) for n=0..31.

FORMULA

a(n) = A058887(n)*2^n

CROSSREFS

Cf. A005277, A007617, A058887.

Sequence in context: A151322 A002320 A151323 * A241478 A113140 A151324

Adjacent sequences:  A181659 A181660 A181661 * A181663 A181664 A181665

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 18 2010

STATUS

approved

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Last modified March 28 15:52 EDT 2017. Contains 284243 sequences.