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Search: id:A069111
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A069111 Square-free part of 2^n+1 : the smallest number such that a(n)*(2^n+1) is a square. +0
1
3, 5, 1, 17, 33, 65, 129, 257, 57, 41, 2049, 4097, 8193, 16385, 3641, 65537, 131073, 262145, 524289, 1048577, 233017, 4194305, 8388609, 16777217, 33554433, 67108865, 1657009, 268435457, 536870913, 42949673, 2147483649, 4294967297 (list; graph; listen)
OFFSET

1,1

PROGRAM

(PARI) for(n=1, 60, print1(core(2^n+1), ", "))

CROSSREFS

Cf. A007913.

Sequence in context: A138259 A077021 A084833 this_sequence A021288 A140735 A126353

Adjacent sequences: A069108 A069109 A069110 this_sequence A069112 A069113 A069114

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 06 2002

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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