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A184967 Numbers n such that n^n+1 is squarefree. 2
1, 2, 4, 5, 6, 8, 9, 10, 12, 13, 16, 20, 21, 22, 24, 25, 26, 28, 29, 30, 32, 33, 34, 36, 37, 41, 42, 44, 45, 46, 48, 50, 52, 54, 56, 57, 58, 60 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

5^5+1=3126=2*3*521,

6^6+1=46657=13*37*97,

8^8=16777217=97*257*673

LINKS

Table of n, a(n) for n=1..38.

MATHEMATICA

Select[Range@46, SquareFreeQ[#^#+1]&]

PROG

(MAGMA) [ n: n in [1..60] | IsSquarefree(n^n+1) ]; // Bruno Berselli, Mar 24 2011

CROSSREFS

Cf. A005117, A184966.

Sequence in context: A277018 A277008 A091529 * A267137 A095775 A035063

Adjacent sequences:  A184964 A184965 A184966 * A184968 A184969 A184970

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Mar 19 2011

EXTENSIONS

Extended by Bruno Berselli, Mar 24 2011

STATUS

approved

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Last modified June 2 17:02 EDT 2020. Contains 334787 sequences. (Running on oeis4.)