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A103677 Numbers m such that in binary representation m! doesn't contain 5!. 5
0, 1, 2, 3, 4, 6, 7, 8, 9, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 24, 26, 28, 30, 31, 32, 36, 46, 53, 58, 65 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Conjecture: there are no further terms;

complement of A103676: A103673(a(n))=0, A103673(A103676(n))=1.

LINKS

Table of n, a(n) for n=1..30.

Index entries for sequences related to factorial numbers

Index entries for sequences related to binary expansion of n

PROG

(PARI) is(n)=n=n!; while(n>119, my(e=valuation(n, 2), e1=valuation((n>>=e)+1, 2)); n>>=e1; if(e>2 && e1>3, return(0))); 1 \\ Charles R Greathouse IV, Apr 07 2013

CROSSREFS

Cf. A102730, A036603, A007088, A000142, A103679, A103681.

Sequence in context: A028237 A194463 A140467 * A087919 A113508 A059325

Adjacent sequences:  A103674 A103675 A103676 * A103678 A103679 A103680

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Feb 12 2005

STATUS

approved

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Last modified July 18 19:00 EDT 2019. Contains 325144 sequences. (Running on oeis4.)