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A072518 Index of smallest triangular number beginning with the n-th triangular number other than itself. 1
4, 8, 11, 14, 17, 20, 75, 85, 95, 105, 36, 39, 135, 145, 155, 165, 553, 58, 616, 648, 680, 711, 743, 77, 806, 838, 869, 901, 933, 96, 996, 1028, 1059, 1091, 1122, 1154, 1186, 1217, 1249, 4050, 1312, 1344, 1375, 1407, 4550, 1470, 1502, 4850, 1565, 5050 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..50.

EXAMPLE

a(7) = 75 as the 75th triangular number 2850 > 28 is the smallest triangular number beginning with 28 which is the seventh triangular number.

CROSSREFS

Cf. A072517.

Sequence in context: A327136 A311032 A311033 * A113553 A248228 A297464

Adjacent sequences:  A072515 A072516 A072517 * A072519 A072520 A072521

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Jul 31 2002

EXTENSIONS

Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 25 2003

STATUS

approved

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Last modified September 26 16:43 EDT 2020. Contains 337374 sequences. (Running on oeis4.)