OFFSET
1,1
COMMENTS
REFERENCES
Shiraishi Chochu (aka Shiraishi Nagatada), Shamei Sampu (Sacred Mathematics), 1826.
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..5000
David Eugene Smith and Yoshio Mikami, A History of Japanese Mathematics, Open Court, Chicago, 1914; Dover reprint, 2004; pp. 233-235.
Wikipedia (French), Shiraishi Nagatada
Wikipedia (German), Shiraishi Nagatada
EXAMPLE
3^3 + 4^3 = 6^3 - 5^3 = 91, so 91 is a member.
MATHEMATICA
Select[#[[2]]-#[[1]]&/@Partition[Range[5000]^3, 2, 1], Count[ IntegerPartitions[ #, {2}], _?(AllTrue[Surd[#, 3], IntegerQ]&)]>0&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Sep 07 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jonathan Sondow, Jun 21 2013
STATUS
approved