A328840 - OEIS

A328840

Numbers with no digit 1 in their primorial base expansion (A049345).

0, 4, 12, 16, 18, 22, 24, 28, 60, 64, 72, 76, 78, 82, 84, 88, 90, 94, 102, 106, 108, 112, 114, 118, 120, 124, 132, 136, 138, 142, 144, 148, 150, 154, 162, 166, 168, 172, 174, 178, 180, 184, 192, 196, 198, 202, 204, 208, 420, 424, 432, 436, 438, 442, 444, 448, 480, 484, 492, 496, 498, 502, 504, 508, 510, 514, 522, 526

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OFFSET

1,2

COMMENTS

Numbers for which the least missing nonzero digit (A329028) in their primorial base expansion is 1.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..92160

Index entries for sequences related to primorial base.

MATHEMATICA

q[n_] := Module[{k = n, p = 2, s = {}, r}, While[{k, r} = QuotientRemainder[k, p]; k != 0 || r != 0, AppendTo[s, r]; p = NextPrime[p]]; FreeQ[s, 1]]; Select[Range[0, 600], q] (* Amiram Eldar, Mar 06 2024 *)

PROG

(PARI)

A329028(n) = { my(m=Map(), p=2); while(n, mapput(m, (n%p), 1); n = n\p; p = nextprime(1+p)); for(k=1, oo, if(!mapisdefined(m, k), return(k))); };

isA328840(n) = (1 == A329028(n));

CROSSREFS

Cf. A049345.

Positions of ones in A329028.

Cf. also A328574 and A329027.

Cf. A255411 for an analogous sequence.

Sequence in context: A119622 A367909 A280892 * A255411 A340929 A067575

Adjacent sequences: A328837 A328838 A328839 * A328841 A328842 A328843

KEYWORD

nonn,base

AUTHOR

Antti Karttunen, Nov 07 2019

STATUS

approved