

A213085


First occurrence of n in A212844.


1



1, 7, 3, 5, 6, 9, 10, 55, 11, 3521, 246, 21, 52, 89969, 286, 60827, 22, 57481, 1501, 31937, 44, 2977, 49, 27, 40, 39806401, 110, 16777, 114, 214293, 24823, 247, 33, 259274569, 222, 2739, 70, 5993, 253217, 1062899, 72, 2007, 215, 85, 140, 4187, 50, 75
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OFFSET

0,2


COMMENTS

It is conjectured that every integer n>=0 appears in A212844 at least once, and therefore every a(n) is defined.
Indices of terms that are bigger than 2^321 and possibly undefined: 69, 91, 114, 127, 141, 157, 175, 181, 195, 301, 313, 339, ...
Indices 69, 127, 175, 181, 301, 313, 339, ... correspond to terms that either do not exist or are greater than 2*10^12.  Charles R Greathouse IV, Aug 13 2015


LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 0..68


EXAMPLE

Smallest n such that A212844(n)=1 is 7, so a(1)=7.


PROG

(PARI) a(n) = my(k=1); while(lift(Mod(2, k)^(k+2)) != n, k++); k; \\ Michel Marcus, Aug 14 2015


CROSSREFS

Cf. A212844, A213381, A213407.
Sequence in context: A253298 A155987 A200279 * A119714 A154889 A135002
Adjacent sequences: A213082 A213083 A213084 * A213086 A213087 A213088


KEYWORD

nonn


AUTHOR

Alex Ratushnyak, Jul 22 2012


STATUS

approved



