A067679 - OEIS

A067679

Numbers m such that sigma(4m+5) = 6m.

3, 16, 91, 304, 5203, 37440, 45136, 32308003, 290634256

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OFFSET

1,1

LINKS

MATHEMATICA

Select[Range[50000], DivisorSigma[1, 4#+5]==6#&] (* The program generates the first 7 terms of the sequence. *) (* Harvey P. Dale, Sep 29 2024 *)

PROG

(PARI) isok(m) = sigma(4*m+5) == 6*m; \\ Michel Marcus, Feb 17 2021

CROSSREFS

KEYWORD

nonn,more,changed

AUTHOR

EXTENSIONS

a(8)-a(9) from Donovan Johnson, Feb 01 2009

STATUS

approved