OFFSET
1,2
FORMULA
All numbers of the forms 5^k, 2*5^k & 6*5^k are in the sequence. - Farideh Firoozbakht, Nov 21 2006
MATHEMATICA
Do[ If[ Mod[ PowerMod[ 4, n, n ] + PowerMod[ 3, n, n ] + PowerMod[ 2, n, n ] + 1, n ] == 0, Print[ n ] ], {n, 1, 10^6} ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Aug 25 2000
STATUS
approved