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A068534
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a(n)=(7^(2^n)-1)/2^(n+2)/150.
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0
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1, 1201, 3461763601, 57522274700204200328401, 31764596032183221357775361004244057832177481618001, 19372599572885568957165529710172832947035894754619777993470030014145668169574231766337989087612412837201
(list; graph; refs; listen; history; internal format)
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