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A052346 Smallest number which is the sum of two positive triangular numbers in exactly n different ways. 7
1, 2, 16, 81, 471, 1056, 1381, 11781, 6906, 17956, 34531, 123256, 40056, 4462656, 305256, 448906, 200281, 1957231, 520731, 10563906, 1001406, 11222656, 539550781, 3454506, 1482081, 75865156, 7172606106, 8852431, 25035156, 334020781, 13018281, 38531031, 7410406 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..32.

EXAMPLE

a(4) = 471 because 471 is the sum of two positive triangular numbers in exactly 4 different ways (as 300+171, 351+120, 435+36, and 465 + 6), and there is no smaller number that has this property.

CROSSREFS

Cf. A000217, A052343, A052344, A052345, A052347, A052348, A053587, A064816.

Sequence in context: A012684 A234004 A053587 * A207482 A207880 A207263

Adjacent sequences:  A052343 A052344 A052345 * A052347 A052348 A052349

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jan 23 2000

EXTENSIONS

a(27), a(28) = 8852431, 25035156; a(26) not yet found

a(26) from Donovan Johnson, Nov 17 2008

Name edited (added the qualifier "positive"), example edited, and a(29)-a(32) added by Jon E. Schoenfield, Jul 16 2017

STATUS

approved

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Last modified August 17 08:02 EDT 2022. Contains 356184 sequences. (Running on oeis4.)