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A086507 If n is even, a(n) = smallest prime == 1 (mod n), If n is odd, a(n) = smallest prime == -1 (mod n). 2
2, 3, 2, 5, 19, 7, 13, 17, 17, 11, 43, 13, 103, 29, 29, 17, 67, 19, 37, 41, 41, 23, 137, 73, 149, 53, 53, 29, 173, 31, 61, 97, 131, 103, 139, 37, 73, 191, 233, 41, 163, 43, 257, 89, 89, 47, 281, 97, 97, 101, 101, 53, 211, 109, 109, 113, 113, 59, 353, 61, 487, 311, 251 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

f:= proc(n) local x;

if n::even then x:= 1 else x:= -1; fi;

do

x:= x+n;

if isprime(x) then return x fi

od

end proc:

map(f, [$1..100]); # Robert Israel, Dec 09 2020

CROSSREFS

Cf. A034694, A038700, A086508.

Sequence in context: A010242 A339645 A318956 * A133568 A120716 A084318

Adjacent sequences: A086504 A086505 A086506 * A086508 A086509 A086510

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Jul 29 2003

EXTENSIONS

More terms from David Wasserman, Mar 09 2005

STATUS

approved

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Last modified February 8 11:05 EST 2023. Contains 360138 sequences. (Running on oeis4.)