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A250042 Numbers n such that m = floor(n/9) is coprime to n and, if nonzero, m is also a term of the sequence. 9
1, 9, 10, 11, 12, 13, 14, 15, 16, 17, 82, 83, 85, 86, 88, 89, 91, 93, 97, 100, 101, 102, 103, 104, 105, 106, 107, 109, 113, 115, 118, 119, 120, 121, 122, 123, 124, 125, 127, 129, 131, 136, 137, 139, 142, 143, 145, 147, 149, 151, 154, 155, 156, 157, 158 (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=9. 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 the link

(PARI) is_rtc(n, b=9) =  {while (((m=gcd(n\b, n)) == 1), if (m == 0, return (1)); if ((n=n\b) == 0, return (1)); ); return (0); } \\ Michel Marcus, Jan 18 2015

CROSSREFS

Cf. A250040 (b=10), A250043.

Other lists of right-truncatable numbers with the property RTC(b): A250036 (b=4), A250038 (b=16), A250044 (b=8), A250046 (b=7), A250048 (b=6), A250050 (b=5).

Sequence in context: A182362 A023392 A060009 * A115843 A058365 A162789

Adjacent sequences:  A250039 A250040 A250041 * A250043 A250044 A250045

KEYWORD

nonn,base

AUTHOR

Stanislav Sykora, Jan 15 2015

STATUS

approved

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Last modified May 22 16:19 EDT 2017. Contains 286882 sequences.