A097659 a(n) = 1001^n.

1, 1001, 1002001, 1003003001, 1004006004001, 1005010010005001, 1006015020015006001, 1007021035035021007001, 1008028056070056028008001, 1009036084126126084036009001, 1010045120210252210120045010001

Offset

0,2

Comments

694 is the smallest exponent e such that 1001^e begins with a digit greater than 1: A000030(a(694)) = 2, A000030(a(693)) = 1. - Reinhard Zumkeller, Nov 05 2010

a(n) gives the n-th row of Pascal's triangle (A007318) as long as all the binomial coefficients have at most three digits, otherwise the binomial coefficients with more than three digits overlap. - Daniel Forgues, Aug 12 2012

References

Rozsa Peter, Playing with Infinity, New York, Dover Publications, 1957.

Links

Table of n, a(n) for n=0..10.

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (1001).

Formula

From Philippe Deléham, Nov 30 2008: (Start)

a(n) = 1001*a(n-1), n > 0; a(0)=1.

G.f.: 1/(1-1001*x). (End)

Prog

(PARI) 1001^n \\ Charles R Greathouse IV, Jan 30 2012

Crossrefs

Cf. A097660, A001020, A096884, A007318.

Sequence in context: A267599 A140927 A261544 * A295462 A143906 A215593

Adjacent sequences: A097656 A097657 A097658 * A097660 A097661 A097662

Keyword

nonn,easy,changed

Author

Reinhard Zumkeller, Aug 18 2004

Status

approved