

A250047


Numbers n such that m = floor(n/7) is not coprime to n and, if nonzero, m is also a term of the sequence.


11



2, 3, 4, 5, 6, 14, 16, 18, 20, 21, 24, 27, 28, 30, 32, 34, 35, 40, 42, 44, 45, 46, 48, 98, 100, 102, 104, 112, 114, 116, 118, 126, 128, 129, 130, 132, 140, 142, 144, 145, 146, 147, 150, 153, 168, 170, 171, 172, 174, 189, 192, 195, 196, 198, 200, 202, 210
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OFFSET

1,1


COMMENTS

See the comments in A250041 which all apply, except for the setting of the base, b=7. In particular, they define the property RTNC(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_rtnc(n, b=7) = {while (((m=gcd(n\b, n)) != 1), if (m == 0, return (1)); n = n\b; ); return (0); } \\ Michel Marcus, Jan 22 2015


CROSSREFS

Cf. A250041 (b=10), A250046.
Other lists of righttruncatable numbers with the property RTNC(b):
A005823 (b=3), A250037 (b=4), A250039 (b=16), A250043 (b=9), A250045 (b=8), A250049 (b=6), A250051 (b=5).
Sequence in context: A204896 A039016 A249102 * A084830 A116044 A116027
Adjacent sequences: A250044 A250045 A250046 * A250048 A250049 A250050


KEYWORD

nonn,base


AUTHOR

Stanislav Sykora, Jan 15 2015


STATUS

approved



