A259182 - OEIS

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A259182

a(n) = prime(n) if n prime otherwise 1.

1, 3, 5, 1, 11, 1, 17, 1, 1, 1, 31, 1, 41, 1, 1, 1, 59, 1, 67, 1, 1, 1, 83, 1, 1, 1, 1, 1, 109, 1, 127, 1, 1, 1, 1, 1, 157, 1, 1, 1, 179, 1, 191, 1, 1, 1, 211, 1, 1, 1, 1, 1, 241, 1, 1, 1, 1, 1, 277, 1, 283, 1, 1, 1, 1, 1, 331, 1, 1, 1, 353, 1, 367, 1, 1, 1, 1

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OFFSET

1,2

COMMENTS

The subsequence of prime terms is A006450.

LINKS

Table of n, a(n) for n=1..77.

EXAMPLE

a(7) = 17 because prime(7) = 17 is prime.

a(8) = 1 because 8 is not prime.

MATHEMATICA

Table[If[! PrimeQ[n], 1, Prime[n]], {n, 100}]