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A160512 a(1)=1. a(2n) = the smallest power of a prime > a(2n-1). a(2n+1) = the smallest squarefree integer > a(2n). 0
1, 2, 3, 4, 5, 7, 10, 11, 13, 16, 17, 19, 21, 23, 26, 27, 29, 31, 33, 37, 38, 41, 42, 43, 46, 47, 51, 53, 55, 59, 61, 64, 65, 67, 69, 71, 73, 79, 82, 83, 85, 89, 91, 97, 101, 103, 105, 107, 109, 113, 114, 121, 122, 125, 127, 128, 129, 131, 133, 137, 138, 139, 141, 149 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The sequence b(1)=1; b(2n) = the smallest squarefree integer > b(2n-1); b(2n+1) = the smallest power of a prime > b(2n), is such that: b(1)=a(1), b(2)=a(2), b(3)=a(3). And, b(n) = a(n+1), for n >= 4. (Ie The sequences are the same except that the integer 4 is excluded from {b(k)}, and except for the indexing after the 3rd term of each sequence.)

LINKS

Table of n, a(n) for n=1..64.

CROSSREFS

Sequence in context: A123091 A191918 A191925 * A144430 A337382 A348253

Adjacent sequences:  A160509 A160510 A160511 * A160513 A160514 A160515

KEYWORD

nonn

AUTHOR

Leroy Quet, May 16 2009

EXTENSIONS

Extended by Ray Chandler, Jun 16 2009

STATUS

approved

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Last modified January 27 22:39 EST 2022. Contains 350654 sequences. (Running on oeis4.)