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A250047
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Numbers n such that m = floor(n/7) is not coprime to n and, if nonzero, m is also a term of the sequence.
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11
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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
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1,1
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COMMENTS
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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).
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LINKS
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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
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PROG
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(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
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CROSSREFS
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Cf. A250041 (b=10), A250046.
Other lists of right-truncatable 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: A334733 A039016 A249102 * A084830 A116044 A116027
Adjacent sequences: A250044 A250045 A250046 * A250048 A250049 A250050
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KEYWORD
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nonn,base
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AUTHOR
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Stanislav Sykora, Jan 15 2015
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STATUS
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approved
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