A171525 - OEIS

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A171525

Numerator of (n-th noncomposite/n).

1, 1, 1, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

COMMENTS

Numerator of (A008578(n)/n). a(1)= a(2) = a(3) = 1, a(n) = A008578(n) = A000040(n-1) for n >= 4.

LINKS

Table of n, a(n) for n=1..50.

PROG

(PARI) a(n)=if(n>3, prime(n-1), 1) \\ Charles R Greathouse IV, Aug 22 2011

CROSSREFS

Sequence in context: A276378 A243292 A271116 * A140475 A171577 A215848

Adjacent sequences: A171522 A171523 A171524 * A171526 A171527 A171528

KEYWORD

nonn,easy

AUTHOR

Jaroslav Krizek, Dec 11 2009

STATUS

approved