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A250044 Numbers n such that m = floor(n/8) is coprime to n and, if nonzero, m is also a term of the sequence. 9
1, 8, 9, 10, 11, 12, 13, 14, 15, 65, 67, 69, 71, 73, 74, 76, 77, 79, 81, 83, 87, 89, 90, 91, 92, 93, 94, 95, 97, 101, 103, 105, 106, 107, 108, 109, 110, 111, 113, 115, 117, 121, 122, 124, 127, 521, 522, 523, 524, 526, 527, 537 (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=8. 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=8) =  {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), A250045.

Other lists of right-truncatable numbers with the property RTC(b): A250036 (b=4), A250038 (b=16), A250042 (b=9), A250046 (b=7), A250048 (b=6), A250050 (b=5).

Sequence in context: A023391 A115419 A161639 * A162788 A115842 A067682

Adjacent sequences:  A250041 A250042 A250043 * A250045 A250046 A250047

KEYWORD

nonn,base

AUTHOR

Stanislav Sykora, Jan 15 2015

STATUS

approved

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Last modified May 26 03:36 EDT 2017. Contains 287073 sequences.