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Search: id:A087360
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A087360 Indices of triangular numbers in A087359. +0
2
1, 2, 3, 5, 6, 8, 12, 59, 72, 812, 1523, 47051, 234380, 82528328, 963837743, 8386720250208, 15040477267097648, 562429063569593838374096, 9285393339731985604589835104960, 631311818053863204637859662148296083530450400 (list; graph; listen)
OFFSET

1,2

FORMULA

a(n) = floor(sqrt(2*A087359(n))). - David Wasserman (wasserma(AT)spawar.navy.mil), May 19 2005

CROSSREFS

Cf. A087359.

Sequence in context: A002243 A094763 A125559 this_sequence A111501 A094565 A034722

Adjacent sequences: A087357 A087358 A087359 this_sequence A087361 A087362 A087363

KEYWORD

nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 08 2003

EXTENSIONS

More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 19 2005

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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