A250044 Numbers n such that m = floor(n/8) is coprime to n and, if nonzero, m is also a term of the sequence.

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

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: A115419 A294238 A161639 * A295291 A162788 A115842

Adjacent sequences: A250041 A250042 A250043 * A250045 A250046 A250047

Keyword

nonn,base

Author

Stanislav Sykora, Jan 15 2015

Status

approved