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 A068519 If n is prime then a(n) = n, else a(n) = prime(n). 7
 2, 2, 3, 7, 5, 13, 7, 19, 23, 29, 11, 37, 13, 43, 47, 53, 17, 61, 19, 71, 73, 79, 23, 89, 97, 101, 103, 107, 29, 113, 31, 131, 137, 139, 149, 151, 37, 163, 167, 173, 41, 181, 43, 193, 197, 199, 47, 223, 227, 229, 233, 239, 53, 251, 257, 263, 269, 271, 59, 281, 61, 293 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Zak Seidov, Table of n, a(n) for n = 1..1000 EXAMPLE a(1) = 2 because 1 is not prime, hence a(1) = prime(1) = 2. a(2) = 2 because 2 is prime. MAPLE seq(`if`(isprime(i), i, ithprime(i)), i=1..100); MATHEMATICA Table[If[PrimeQ[n], n, Prime[n]], {n, 1, 200}] (* Zak Seidov, Nov 04 2009 *) CROSSREFS Sequence in context: A354377 A051301 A002583 * A342848 A339826 A108041 Adjacent sequences: A068516 A068517 A068518 * A068520 A068521 A068522 KEYWORD nonn,easy AUTHOR Francois Jooste (phukraut(AT)hotmail.com), Mar 18 2002 EXTENSIONS More terms, b-file and Mathematica code from Zak Seidov, Nov 04 2009 STATUS approved

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Last modified March 1 04:50 EST 2024. Contains 370430 sequences. (Running on oeis4.)