1PDLZ OVNFSJDBMTFRVFODF3FQVOJU OVNCFS`T BEEJUJPOUIFPSFN# &OHMJTI4FNJOBS/BHBPLB 6OJWFSTJUZ PG 5FDIOPMPHZ"UPN :PTIJ[BXB
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$POUFOUT *OUSPEVDUJPO(2) What is Pocky (Repunit) number ? 1PDLZ OVNCFS`T CBTJDUIFPSFN 1PDLZ OVNCFS`TBEEJUJPOUIPSFN $PODMVTJPO
5PEBZ /PWJT1PDLZ EBZ#ZUIFXBZ %PZPVLOPXBEEJUJPOUIFPSFNsin + = sin cos + cos sin cos + = cos cos − sin sin 3*OUSPEVDUJPO
'JCPOBDDJOVNCFS,-.= ,-/+ ,, 1= 0, /= 1, .= 1, ⋯'JCPOBDDJOVNCFS`TBEEJUJPOUIFPSFN5-6= 5-/6+ 567/&Y8= /-9= /:+ .9= 1 ; 2 + 1 ; 3 = 54*OUSPEVDUJPO
1PDLZ(Repunit) OVNCFS@A/1,,= ,%FDJNBMTZTUFN1= 0, /= 1, .= 11, := 111, 9= 1111,*TUIFSF1PDLZ OVNCFS`TBEEJUJPOUIFPSFN5-6= ?5*OUSPEVDUJPO
m n 0 1 2 3 4 510 0 1 11 111 1111 111119 0 1 10 91 820 820+9^48 0 1 9 73 585 585+8^47 0 1 8 57 400 400+7^46 0 1 7 43 256 256+6^45 0 1 6 31 156 156+5^44 0 1 5 21 85 3413 0 1 4 13 40 1212 0 1 3 7 15 311 0 1 2 3 4 56What is Pocky (Repunit) number ?@,,(Ex. @A.,,A.= (11).= 3)
@,,-/= @,,+ , (@,,A1= 0)@,,= IJA1,7/J =, − 1 − 1, ∈ ℕlim,→Q@,,-/@,,= , lim@→Q@-/,,@,,= 171PDLZ OVNCFS`T CBTJDUIFPSFN
@,,-.= @,,-/+ ,-/ = @,,-/+ (@,,-/− @,,)R@,,-/= 0 ; @,,+ 1 ; @,,-/@,,-.= −@,,+ 1 + @,,-/@,,-/@,,-.=0 1− 1 + @,,@,,-/81PDLZ OVNCFS`TBEEJUJPOUIPSFN
@,,=@,,@,,-/, ℛ =0 1− 1 + @,,= ℛ,@,,A1@,,A1=0191PDLZ OVNCFS`TBEEJUJPOUIPSFN
ℛ, = @,,=@,,@,,-/= ℛ,@,,A1= 01=@,,7/= ℛ,7/@,,A1= ℛ,ℛ7/@,,A1= −10= −1101PDLZ OVNCFS`TBEEJUJPOUIPSFN
ℛ, =−@,,7/@,,−@,,@,,-/ℛ5-6 = ℛ5ℛ6−@,5-67/@,5-6−@,5-6@,5-6-/=−@,57/@,5−@,5@,5-/−@,67/@,6−@,6@,6-/@,5-6= @,5@,6-/− @,57/@,6111PDLZ OVNCFS`TBEEJUJPOUIPSFN
Change → , → @,5-6= @,5-/@,6− @,5@,67/&Y/1, /-9= /1,./1,9− 10/1,//1,:= 11 ; 1111 − 10 ; 1 ; 111 = 12221 − 1110= 11111121PDLZ OVNCFS`TBEEJUJPOUIPSFN
., /-9= .,..,9− 2.,/.,:= 3 ; 15 − 2 ; 1 ; 7= 45 − 14 = 31 = (11111).., .-:= .,:.,:− 2.,..,.= 7 ; 7 − 2 ; 3 ; 3= 49 − 18 = 31 = (11111)./, /-9= /,..,9− /,//,:= 2 ; 4 − 1 ; 3= 5 = (11111)/131PDLZ OVNCFS`TBEEJUJPOUIPSFN
"EEJUJPOUIFPSFNsin + = sin cos + cos sin cos + = cos cos − sin sin 5-6= 5-/6+ 567/@,5-6= @,5-/@,6− @,5@,67/14$PODMVTJPO
ɾ1PDLZ OVNCFS`TBEEJUJPOUIFPSFNMJLFDPTJOFGVODUJPOJOUSJHPOPNFUSJDBEEJUJPOUIFPSFNTɾ1PDLZ OVNCFS`TBEEJUJPOUIFPSFNJTFYUFOTJPOPG OBUVSBMOVNCFS`TUIBU15$PODMVTJPOm n 0 1 2 3 4 510 0 1 11 111 1111 111111 0 1 2 3 4 5