A250049 Numbers n such that m = floor(n/6) is not coprime to n and, if nonzero, m is also a term of the sequence.

2, 3, 4, 5, 12, 14, 16, 18, 21, 24, 26, 28, 30, 35, 72, 74, 75, 76, 84, 86, 88, 96, 98, 100, 108, 110, 111, 112, 126, 129, 144, 146, 147, 148, 156, 158, 160, 168, 170, 172, 180, 182, 183, 184, 185, 210, 215, 432, 434, 435, 436, 444, 446, 448, 450, 453, 455

Offset

1,1

Comments

See the comments in A250041 which all apply, except for the setting of the base, b=6. 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 A250041 for b=6
(PARI) is_rtnc(n, b=6) = {while (((m=gcd(n\b, n)) != 1), if (m == 0, return (1)); n = n\b; ); return (0); } \\ Michel Marcus, Jan 31 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), A250047 (b=7), A250051 (b=5).

Sequence in context: A050745 A077375 A328209 * A132027 A306077 A329793

Adjacent sequences: A250046 A250047 A250048 * A250050 A250051 A250052

Keyword

nonn,base

Author

Stanislav Sykora, Jan 31 2015

Status

approved