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A336189 The perfect square integer sum of a square block of integers, with 1 at the top-left corner, on a diagonally numbered 2D board. 1
1, 48841, 151757761, 7148452448281, 22211509021338121, 1046258952151234702321, 3250912043200499426917081, 153132136343696050161247674961, 475808694603918281112156880430641 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
See A336186 for the corresponding square edge length and an explanation of the sequence. Note that the currently known terms all end in 1.
LINKS
Eric Angelini, Prime squares and square squares, personal blog "Cinquante signes", Jun. 29, 2020.
EXAMPLE
a(1) = 1 = 1^2.
a(2) = 48841 = 221^2.
a(3) = 151757761 = 12319^2.
a(4) = 7148452448281 = 2673659^2.
a(5) = 22211509021338121 = 149035261^2.
a(6) = 1046258952151234702321 = 32345926361^2.
a(7) = 3250912043200499426917081 = 1803028575259^2.
a(8) = 153132136343696050161247674961 = 391321014441719^2.
a(9) = 475808694603918281112156880430641 = 21813039554448121^2.
See A336186 for a diagram of the 2D board and examples.
CROSSREFS
Sequence in context: A210401 A067869 A175278 * A157667 A176373 A237087
KEYWORD
nonn,more
AUTHOR
STATUS
approved

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Last modified March 29 09:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)