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A305348 a(n) is the smallest number k such that k * A002202(n) is not a term of A000010. 0
3, 7, 17, 15, 19, 5, 43, 19, 5, 17, 7, 167, 11, 3, 19, 67, 17, 17, 7, 5, 211, 7, 11, 13, 3, 139, 31, 9, 5, 109, 3, 85, 3, 61, 11, 7, 211, 11, 5, 7, 3, 31, 5, 31, 13, 353, 9, 31, 3, 71, 5, 3, 19, 317, 5, 3, 31, 167, 7, 7, 5, 71, 3, 59, 3, 53, 17, 5, 211, 11, 3, 17, 43, 19, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) is an odd number >= 3.

a(1) * A002202(1) = 3 is the only value not a term of the sequence A005277.

Terms of this sequence map terms of A002202 to terms of A005277 and the image of these mappings is a subset of A005277. For example, between A005277(1) = 14 and A005277(5) = 50, there is no mapping.

LINKS

Table of n, a(n) for n=1..75.

EXAMPLE

3 is a term because 3 * A002202(1) = 3 and 3 is not a term of A000010.

7 is a term because 7 * A002202(2) = 14 and 14 is not a term of A000010.

PROG

(PARI) f(n) = my(k=1); while(istotient(k*n), k++); k;

lista(nn) = {for (n=1, nn, if (istotient(n), print1(f(n), ", ")); ); } \\ Michel Marcus, Jun 01 2018

CROSSREFS

Cf. A000010, A002202, A005277.

Sequence in context: A000963 A133593 A297154 * A191147 A227211 A271725

Adjacent sequences:  A305345 A305346 A305347 * A305349 A305350 A305351

KEYWORD

nonn

AUTHOR

Torlach Rush, May 30 2018

EXTENSIONS

More terms from Michel Marcus, Jun 01 2018

STATUS

approved

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Last modified May 24 18:27 EDT 2022. Contains 354043 sequences. (Running on oeis4.)