A078331 - OEIS

A078331

First prime such that p^2==1 (mod n).

2, 3, 2, 3, 11, 5, 13, 3, 17, 11, 23, 5, 53, 13, 11, 7, 67, 17, 37, 11, 13, 23, 47, 5, 101, 53, 53, 13, 59, 11, 61, 17, 23, 67, 29, 17, 73, 37, 53, 11, 83, 13, 173, 23, 19, 47, 281, 7, 97, 101, 67, 53, 107, 53, 89, 13, 37, 59, 353, 11, 367, 61, 71, 31, 79, 23, 269, 67, 47, 29

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..70.

EXAMPLE

a(2)=3 because 3^2=9==1 (mod 2), while 2^2==0 (mod 2).

PROG

(PARI) for (n=1, 100, forprime(p=2, 1000, if ((p^2-1)%n==0, print1(p", "); break)))

CROSSREFS

Sequence in context: A117936 A264766 A251090 * A093868 A194603 A183465

Adjacent sequences: A078328 A078329 A078330 * A078332 A078333 A078334

KEYWORD

nonn

AUTHOR

Jon Perry, Nov 21 2002

STATUS

approved