login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A250050 Numbers n such that m = floor(n/5) is coprime to n and, if nonzero, m is also a term of the sequence. 8
1, 5, 6, 7, 8, 9, 26, 27, 28, 29, 31, 36, 37, 38, 39, 41, 43, 46, 47, 49, 131, 133, 136, 137, 139, 141, 143, 146, 147, 148, 149, 156, 157, 158, 159, 181, 186, 187, 188, 189, 191, 193, 196, 197, 199, 206, 207, 208, 209, 216, 217, 218, 219, 231, 233, 236, 237 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See the comments in A250040 which all apply, except for the setting of the base, b=5. In particular, they define the property RTC(b).

LINKS

Stanislav Sykora, Table of n, a(n) for n = 1..10000

Stanislav Sykora, PARI/GP scripts for genetic threads, with code and comments.

Wikipedia, Coprime integers

PROG

(PARI) \\ See A250040 for b=5

(PARI) is_rtc(n, b=5) =  {while (((m=gcd(n\b, n)) == 1), if (m == 0, return (1)); if ((n=n\b) == 0, return (1)); ); return (0); } \\ Michel Marcus, Jan 31 2015

CROSSREFS

Cf. A250040 (b=10), A250047.

Other lists of right-truncatable numbers with the property RTC(b): A250036 (b=4), A250038 (b=16), A250042 (b=9), A250044 (b=8), A250046 (b=7), A250048 (b=6).

Sequence in context: A037362 A102717 A015977 * A051052 A119368 A088721

Adjacent sequences:  A250047 A250048 A250049 * A250051 A250052 A250053

KEYWORD

nonn,base

AUTHOR

Stanislav Sykora, Jan 31 2015

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified June 28 16:56 EDT 2017. Contains 288839 sequences.