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A076972 a(n) = index of the triangular number A076971(n). 1
1, 2, 3, 5, 7, 10, 15, 21, 30, 43, 61, 87, 123, 174, 247, 349, 494, 699, 989, 1399, 1979, 2799, 3959, 5599, 7919, 11199, 15838, 22399, 31677, 44799, 63355, 89598, 126711, 179197, 253423, 358395, 506847, 716790, 1013695, 1433581, 2027390, 2867163 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Cf. A076971.
Sequence in context: A238543 A184641 A225490 * A301756 A170877 A003410
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Oct 21 2002
EXTENSIONS
Corrected and extended by Sascha Kurz, Jan 22 2003
STATUS
approved

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Last modified June 12 18:11 EDT 2024. Contains 373359 sequences. (Running on oeis4.)