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A098565 Numbers that appear as binomial coefficients exactly 6 times. 7
120, 210, 1540, 7140, 11628, 24310, 61218182743304701891431482520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A059233(a(n)) = 3. - Reinhard Zumkeller, Dec 24 2012

REFERENCES

See A003015

LINKS

Table of n, a(n) for n=1..7.

Wikipedia, Singmaster's conjecture

Index entries for triangles and arrays related to Pascal's triangle

PROG

(Haskell)

import Data.List (elemIndices)

a098565 n = a098565_list !! (n-1)

a098565_list = map (+ 2 ) $ elemIndices 3 a059233_list

-- Reinhard Zumkeller, Dec 24 2012

CROSSREFS

See A098564 for more information.

Cf. A185024, A182237, subsequence of A003015.

Sequence in context: A064224 A069674 A003015 * A084142 A256814 A232743

Adjacent sequences:  A098562 A098563 A098564 * A098566 A098567 A098568

KEYWORD

nonn,more

AUTHOR

Paul D. Hanna, Oct 27 2004

EXTENSIONS

a(7) from T. D. Noe, Jul 13 2005

STATUS

approved

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Last modified May 30 04:27 EDT 2017. Contains 287305 sequences.