A049059 - OEIS

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A049059

Third element t of (-1)sigma sociable triple (r,s,t): s=(-1)sigma(r), t=(-1)sigma(s), r=(-1)sigma(t), where if x=Product p(i)^r(i), then (-1)sigma(x)=Product(-1+(Sum p(i)^s(i), s(i)=1 to r(i))).

52, 156, 780, 1248, 13260, 19968, 468480

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OFFSET

0,1

COMMENTS

Definition unclear, see comments in A049057. - Sean A. Irvine, Jul 17 2021

LINKS

Table of n, a(n) for n=0..6.

EXAMPLE

Factorizations 2^2*13, 2^2*3*13, 2^2*3*5*13, 2^5*3*13, 2^2*3*5*13*17, 2^9*3*13, 2^9*3*5*61

CROSSREFS

Cf. A049057, A049058, A049060.

Sequence in context: A044384 A044765 A297627 * A345240 A292172 A166390

Adjacent sequences: A049056 A049057 A049058 * A049060 A049061 A049062

KEYWORD

nonn

AUTHOR

Yasutoshi Kohmoto

STATUS

approved