A250038 Numbers n such that m = floor(n/16) is coprime to n and, if nonzero, m is also a term of the sequence.

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

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 * A296754 A297284 A270043

Adjacent sequences: A250035 A250036 A250037 * A250039 A250040 A250041

Keyword

nonn,base

Author

Stanislav Sykora, Dec 07 2014

Status

approved