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qwq ♀
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\displaystyle \sum_{i=1}^n [i,i+1,\cdots, i+k] \pmod{10^9+7}
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Accepted problems:198 problems
394360616772899011019920224330633035536336436737738940240843644246049552653255956367671776176778979783685288088188692192292394995295395699210431059106010641083112611431144116311791204122212261241124312541293130513091314143614651490167017581774181518641877196320472066209121102115212021232125212921422178221322432267227622792302234823512352237823802409243025072512258226312634270027072710271127172753289529482968304730583086309730983242324632493269327433243340348935543555356136003836400740094018406041154117420542084210426043564402465746584661492749974998512251375143516553495350535153525353568356845685568756895693569461046106610861106112612761286129613061316132613461356136613761386231623663136314631563406605215392160621621216242167821692
Tried problems:31 problems
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