A326844 - OEIS

A326844

Let y be the integer partition with Heinz number n. Then a(n) is the size of the complement, in the minimal rectangular partition containing the Young diagram of y, of the Young diagram of y.

0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 2, 0, 3, 1, 0, 0, 1, 0, 4, 2, 4, 0, 3, 0, 5, 0, 6, 0, 3, 0, 0, 3, 6, 1, 2, 0, 7, 4, 6, 0, 5, 0, 8, 2, 8, 0, 4, 0, 2, 5, 10, 0, 1, 2, 9, 6, 9, 0, 5, 0, 10, 4, 0, 3, 7, 0, 12, 7, 4, 0, 3, 0, 11, 1, 14, 1, 9, 0, 8, 0, 12, 0, 8, 4, 13, 8, 12, 0, 4, 2, 16, 9, 14, 5, 5, 0, 3, 6, 4

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OFFSET

1,10

COMMENTS

The Heinz number of an integer partition (y_1,...,y_k) is prime(y_1)*...*prime(y_k).

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

FORMULA

a(n) = A001222(n) * A061395(n) - A056239(n).

EXAMPLE

The partition with Heinz number 7865 is (6,5,5,3), with diagram:

o o o o o o

o o o o o .

o o o . . .

The size of the complement (shown in dots) in a 6 X 4 rectangle is 5, so a(7865) = 5.

MATHEMATICA

Table[If[n==1, 0, With[{y=Flatten[Cases[FactorInteger[n], {p_, k_}:>Table[PrimePi[p], {k}]]]}, Max[y]*Length[y]-Total[y]]], {n, 100}]

PROG

(PARI)

A056239(n) = if(1==n, 0, my(f=factor(n)); sum(i=1, #f~, f[i, 2] * primepi(f[i, 1])));

A061395(n) = if(n>1, primepi(vecmax(factor(n)[, 1])), 0);

A326844(n) = ((bigomega(n)*A061395(n)) - A056239(n)); \\ Antti Karttunen, Feb 10 2023

CROSSREFS

Cf. A056239, A061395, A106529, A112798, A268192.

Cf. A316413, A326836, A326837, A326845, A326846, A326848.

Sequence in context: A035455 A029191 A094098 * A261079 A182485 A164960

Adjacent sequences: A326841 A326842 A326843 * A326845 A326846 A326847

KEYWORD

nonn

AUTHOR

Gus Wiseman, Jul 26 2019

EXTENSIONS

Data section extended up to term a(100) by Antti Karttunen, Feb 10 2023

STATUS

approved