

A121923


a(n) = smallest odd m such that (m^n + (m+2)^n)/2 is prime.


0



2, 17, 37, 4481, 101, 21601, 197, 257, 106921, 401, 237161, 577, 677, 391337974721, 815401, 1054721, 1297, 2093801, 1601, 3122281, 3759713, 6265001, 2917, 3137, 12981601, 16801793, 4357, 5477, 33396833, 2867651480694307162235699968001
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..30.


PROG

(PARI) anplusbn(n) = { a=1; forstep(a=1, n, 2, for(x=1, n, y=(a^x+(a+2)^x)/2; if(ispseudoprime(y), print1(y", "); break; ) ) ) }


CROSSREFS

Sequence in context: A041965 A095075 A069042 * A212276 A000956 A031906
Adjacent sequences: A121920 A121921 A121922 * A121924 A121925 A121926


KEYWORD

nonn


AUTHOR

Cino Hilliard, Sep 10 2006, corrected Nov 15 2006


STATUS

approved



