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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
OFFSET
1,1
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 A342279 A248228
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