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A087178
((1/2)/p^2)*(T(p)-1) where p runs through the prime >=5 and T(k) is the k-th central trinomial number (A002426).
0
1, 4, 106, 630, 26185, 178666, 8991709, 3678166249, 28031525940, 13143231877116, 824038411943548, 6585233816779471, 427212999940414402, 230740449590738871715, 128696758387000610268418
OFFSET
1,2
COMMENTS
T(n)==1 (mod n^2) iff n is prime
CROSSREFS
Sequence in context: A157039 A171117 A203313 * A104595 A356201 A222930
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Oct 19 2003
STATUS
approved