The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation. Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A328574 a(1) = 0, and then after numbers n whose primorial base expansion doesn't contain any nonleading zeros. 4
 0, 1, 3, 5, 9, 11, 15, 17, 21, 23, 27, 29, 39, 41, 45, 47, 51, 53, 57, 59, 69, 71, 75, 77, 81, 83, 87, 89, 99, 101, 105, 107, 111, 113, 117, 119, 129, 131, 135, 137, 141, 143, 147, 149, 159, 161, 165, 167, 171, 173, 177, 179, 189, 191, 195, 197, 201, 203, 207, 209, 249, 251, 255, 257, 261, 263, 267, 269, 279, 281, 285 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS After the initial zero, numbers n for which A276086(n) produces an even number with no gaps in its prime factorization. Numbers n such that A276086(n) is in A055932; numbers for which A328475(n) is equal to A328572(n) = A003557(A276086(n)). LINKS Antti Karttunen, Table of n, a(n) for n = 1..10000 PROG (PARI) A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); }; isA055932(n) = { my(f=factor(n)[, 1]~); f==primes(#f); }; \\ From A055932 isA328574(n) = isA055932(A276086(n)); (PARI) A328475(n) = { my(m=1, p=2, y=1); while(n, if(n%p, m *= p^((n%p)-y), y=0); n = n\p; p = nextprime(1+p)); (m); }; A328572(n) = { my(m=1, p=2); while(n, if(n%p, m *= p^((n%p)-1)); n = n\p; p = nextprime(1+p)); (m); }; isA328574(n) = (A328475(n) == A328572(n)); CROSSREFS Cf. A003557, A055932, A276086, A328475, A328572. Positions of 1's in A328573, positions of 0's in A329027, cf. also A328840. Cf. A227157 for analogous sequence. Sequence in context: A285519 A047270 A084060 * A227157 A024896 A160771 Adjacent sequences:  A328571 A328572 A328573 * A328575 A328576 A328577 KEYWORD nonn,base AUTHOR Antti Karttunen, Oct 20 2019 EXTENSIONS Primary definition changed, the old definition moved to comment section by Antti Karttunen, Nov 03 2019 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 8 04:26 EDT 2020. Contains 333312 sequences. (Running on oeis4.)