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 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 (list; graph; refs; listen; history; text; internal format)
 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 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 KEYWORD nonn,base AUTHOR Stanislav Sykora, Jan 15 2015 STATUS approved

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Last modified February 26 12:54 EST 2024. Contains 370352 sequences. (Running on oeis4.)