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A250038 Numbers n such that m = floor(n/16) is coprime to n and, if nonzero, m is also a term of the sequence. 9
1, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 257, 259, 261, 263, 265, 267, 269, 271, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 289, 293, 295, 299, 301, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314 (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=16. In particular, they define the property RTC(b).

This particular list is an infinite subset of A248501.

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=16) =  {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. A248501, A250039, A250040.

Other lists of right-truncatable numbers with the property RTC(b): A250036 (b=4), A250040 (b=10), A250042 (b=9), A250044 (b=8), A250046 (b=7), A250048 (b=6), A250050 (b=5).

Sequence in context: A004457 A248501 A115420 * A270043 A209726 A145449

Adjacent sequences:  A250035 A250036 A250037 * A250039 A250040 A250041

KEYWORD

nonn,base

AUTHOR

Stanislav Sykora, Dec 07 2014

STATUS

approved

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Last modified July 24 21:38 EDT 2017. Contains 289777 sequences.