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A144407 A058529(n+1)^2. 1
49, 289, 529, 961, 1681, 2209, 2401, 5041, 5329, 6241, 7921, 9409, 10609, 12769, 14161, 16129, 18769, 22801, 25921, 27889, 36481, 37249, 39601, 47089, 49729, 54289, 57121, 58081, 66049, 69169, 73441, 78961, 82369, 83521, 96721, 97969 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The last digit is either 1 or 9 .

LINKS

Table of n, a(n) for n=1..36.

M. de Frenicle, Methode pour trouver la solutions des problemes par les exclusions, in: Divers ouvrages des mathematiques et de physique par messieurs de l'academie royale des sciences, (1693) pp 1-44.

MATHEMATICA

Select[Range[500], Union[Abs[Mod[FactorInteger[#][[All, 1]], 8, -1]]] == {1} &]^2 // Rest (* Jean-Fran├žois Alcover, Sep 21 2015, after T. D. Noe *)

CROSSREFS

Sequence in context: A167719 A239211 A198437 * A089552 A017354 A239607

Adjacent sequences:  A144404 A144405 A144406 * A144408 A144409 A144410

KEYWORD

nonn

AUTHOR

Paul Curtz, Sep 30 2008

STATUS

approved

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Last modified September 18 09:40 EDT 2019. Contains 327168 sequences. (Running on oeis4.)