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 A325390 Heinz number of the negated differences plus one of the integer partition with Heinz number n (with the last part taken to be 0). 12
 1, 3, 5, 6, 7, 9, 11, 12, 10, 15, 13, 18, 17, 21, 15, 24, 19, 18, 23, 30, 25, 33, 29, 36, 14, 39, 20, 42, 31, 27, 37, 48, 35, 51, 21, 36, 41, 57, 55, 60, 43, 45, 47, 66, 30, 69, 53, 72, 22, 30, 65, 78, 59, 36, 35, 84, 85, 87, 61, 54, 67, 93, 50, 96, 49, 63, 71 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The Heinz number of a positive integer sequence (y_1,...,y_k) is prime(y_1)*...*prime(y_k). The differences of a sequence are defined as if the sequence were increasing, so for example the differences of (6,3,1) (with the last part taken to be 0) are (-3,-2,-1). LINKS EXAMPLE The Heinz number of (6,3,1) is 130, and its negated differences plus one are (4,3,2), which has Heinz number 105, so a(130) = 105. MATHEMATICA primeptn[n_]:=If[n==1, {}, Reverse[Flatten[Cases[FactorInteger[n], {p_, k_}:>Table[PrimePi[p], {k}]]]]]; Table[Times@@Prime/@(1-Differences[Append[primeptn[n], 0]]), {n, 100}] CROSSREFS Number of appearances of n is A325392(n). Positions of squarefree numbers are A325367. Cf. A007294, A007862, A056239, A112798, A320509, A325324, A325327, A325351, A325352, A325362, A325364, A325460, A325461. Sequence in context: A247523 A169957 A165712 * A296365 A291166 A161373 Adjacent sequences:  A325387 A325388 A325389 * A325391 A325392 A325393 KEYWORD nonn AUTHOR Gus Wiseman, May 02 2019 STATUS approved

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Last modified December 10 12:22 EST 2019. Contains 329895 sequences. (Running on oeis4.)