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A224499 Numbers n such that if 2n+1 divides 2^n+1 then 2(n+1)+1 also divides 2^(n+1)+1. 0
1, 5, 29, 53, 89, 113, 173, 209, 329, 413, 509, 545, 713, 725, 809, 833, 893, 965, 1013, 1133, 1169, 1625, 1649, 1685, 1733, 1769, 1925, 2009, 2045, 2129, 2273, 2393, 2465, 2549, 2825, 2933, 3065, 3149, 3329, 3389, 3413, 3473, 3605, 3653, 3665, 3773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

First of a pair of consecutive Curzon numbers, where Curzon numbers are given by A224486.

LINKS

Table of n, a(n) for n=1..46.

MATHEMATICA

CuQ[n_] := IntegerQ[(2^n + 1)/(2*n + 1)]; Select[Range[4000], CuQ[#] && CuQ[# + 1] &]

CROSSREFS

Cf. A224486.

Sequence in context: A146829 A201712 A271923 * A107003 A141374 A147153

Adjacent sequences:  A224496 A224497 A224498 * A224500 A224501 A224502

KEYWORD

nonn

AUTHOR

Jayanta Basu, Apr 08 2013

STATUS

approved

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Last modified May 24 03:21 EDT 2017. Contains 286937 sequences.