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A270895
Sierpiński numbers that are squares.
1
18213931681, 5044241991721, 6093734165401, 6278567569849, 17919144076201, 52536446729209, 56470430531761, 72659547739249, 107737943736721, 123343213788001, 136925780937841, 170306127919321, 211292941174561, 296693149397089, 321058916825689
OFFSET
1,1
COMMENTS
This sequence contains infinitely many numbers that end in 5. See also A233469.
FORMULA
A000290 INTERSECT A076336.
a(n) = A270896(n)^2.
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
STATUS
approved