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 A195333 Numbers n that can be expressed as the sum of the arithmetic derivatives of k consecutive numbers starting from n for some k. 2
 1, 2, 4, 6, 25, 27, 33, 42, 221, 274, 581, 1957, 3125, 11406, 47058, 823543, 1535573, 5056941, 19246541, 19571621, 36861842, 50330577, 2590282517, 45546909393 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A051674 is a subset of this sequence. LINKS FORMULA n = Sum{j=1..k} (n+j-1)', for some k >= 1. EXAMPLE k=1: n=27 -> 27 = 27’. k=2: n=33 -> 33 = 33’+34’ = 14+19. k=3: n=1957 -> 1957 = 1957’+1958’+1959’ = 122+1179+656. MAPLE with(numtheory); A195333:=proc(i) local b, c, n, p; for n from 1 to i do c:=0; b:=-1;   while c

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Last modified September 19 13:56 EDT 2020. Contains 337178 sequences. (Running on oeis4.)