A246934 - OEIS

A246934

The closest square to n-th prime.

1, 4, 4, 9, 9, 16, 16, 16, 25, 25, 36, 36, 36, 49, 49, 49, 64, 64, 64, 64, 81, 81, 81, 81, 100, 100, 100, 100, 100, 121, 121, 121, 144, 144, 144, 144, 169, 169, 169, 169, 169, 169, 196, 196, 196, 196, 225, 225, 225, 225, 225, 225, 256, 256, 256, 256, 256, 256, 289, 289, 289, 289

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OFFSET

1,2

LINKS

Zak Seidov, Table of n, a(n) for n = 1..1000

EXAMPLE

a(5) = 9 because 5th prime is 11, and 11-9<16-11, that is 9 is the closest square to 11.

PROG

(PARI){forprime (p = 2, 300, a = sqrtint (p); b = (a + 1)^2; a = a^2;

s = if (b - p > p - a, a, b); print1 (s ", "))}

CROSSREFS

Sequence in context: A162564 A014694 A065730 * A378035 A206919 A168039

Adjacent sequences: A246931 A246932 A246933 * A246935 A246936 A246937

KEYWORD

nonn

AUTHOR

Zak Seidov, Oct 02 2014

STATUS

approved