A103679 - OEIS

A103679

Numbers m such that in binary representation m! doesn't contain 6!.

0, 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 24, 25, 26, 27, 28, 29, 33, 34, 35, 36, 38, 39, 40, 41, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 54, 56, 57, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 72, 73, 75, 76, 77, 78, 79, 80, 82, 83, 84, 85, 87

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OFFSET

1,3

COMMENTS

Complement of A103678: A103674(a(n))=0, A103674(A103678(n))=1.

Last term is probably 802. No numbers between 803 and 500000 belong to the sequence. - Giovanni Resta, Apr 07 2013

LINKS

Table of n, a(n) for n=1..72.

Index entries for sequences related to factorial numbers

Index entries for sequences related to binary expansion of n

MATHEMATICA

Select[Range[0, 100], SequenceCount[IntegerDigits[#!, 2], {1, 0, 1, 1, 0, 1, 0, 0, 0, 0}]==0&] (* Harvey P. Dale, Oct 12 2024 *)

PROG

(PARI) is(n)=n=n!; while(n>719, my(e=valuation(n, 2), e1=valuation((n>>=e)+1, 2)); n>>=e1; if(e>3 && e1==1 && bitand(n, 31)==22, return(0))); 1 \\ Charles R Greathouse IV, Apr 07 2013

CROSSREFS

Cf. A102730, A036603, A007088, A000142, A103677, A103681.

Sequence in context: A377313 A249407 A360305 * A376745 A029916 A175407

Adjacent sequences: A103676 A103677 A103678 * A103680 A103681 A103682

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Feb 12 2005

STATUS

approved