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A171265 Primes of the form 1 + 6-multiperfect numbers. 4
9186050031556349952001, 837294585717161066223413745156096001, 102833200965458113792221682653890347008001, 8564360335859979576063023115658227351552001 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Primes of the form 1+A046061(n). A subsequence of A093034. This sequence has only 8 terms. a(5)=1+A046061(76),a(6)=1+A046061(79),
a(7)=1+A046061(204) and a(8)=1+A046061(209).
If p is a term of this sequence then for each positive integer k, x=p^k is a solution for the equation sigma(phi(x))=6(x-1). See comment lines of the sequence A093034.
LINKS
EXAMPLE
p=9186050031556349952001 is prime and sigma(p-1)/(p-1)=6, so p is in the sequence.
CROSSREFS
Sequence in context: A115542 A343266 A330009 * A353185 A180247 A095440
KEYWORD
fini,nonn
AUTHOR
STATUS
approved

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Last modified April 19 23:40 EDT 2024. Contains 371798 sequences. (Running on oeis4.)