A213085 First occurrence of n in A212844.

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

Offset: 0

Author

Alex Ratushnyak, Jul 22 2012

Keywords

• nonn

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 2^32-1 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

Examples

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

Links

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

Crossrefs

Cf. A212844, A213381, A213407.

Programs

PARI

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