

A096229


0*9, 1*8, 2*7, 3*6, 4*5; 10*19, 11*18, ..., 14*15; 20*29, 21*28, ..., 24*25; 30*39, ...


1



0, 8, 14, 18, 20, 190, 198, 204, 208, 210, 580, 588, 594, 598, 600, 1170, 1178, 1184, 1188, 1190, 1960, 1968, 1974, 1978, 1980, 2950, 2958, 2964, 2968, 2970, 4140, 4148, 4154, 4158, 4160, 5530, 5538, 5544, 5548, 5550, 7120, 7128, 7134, 7138, 7140, 8910
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OFFSET

0,2


LINKS

Table of n, a(n) for n=0..45.


FORMULA

a(n) = (floor(n/5)*10+(n mod 5)) * (floor(n,5)*10+9(n mod 5))  Colin Barker, Feb 21 2013
Empirical g.f.: 2*x*(15*x^9x^82*x^73*x^64*x^5+85*x^4+x^3+2*x^2+3*x+4) / ((x1)^3*(x^4+x^3+x^2+x+1)^2). [Colin Barker, Feb 21 2013]


EXAMPLE

0 = 9 * 0,
8 = 8 * 1,
190 = 19 * 10,
580 = 29 * 20 and so on


PROG

(PARI) A096229(n) = (n\5*10+n%5) * (n\5*10+9n%5) \\ Colin Barker, Feb 21 2013


CROSSREFS

Sequence in context: A084021 A138666 A072835 * A231718 A212020 A283597
Adjacent sequences: A096226 A096227 A096228 * A096230 A096231 A096232


KEYWORD

easy,nonn


AUTHOR

Odimar Fabeny, Jul 29 2004


EXTENSIONS

More terms from Atilla Bora (borabanana(AT)gmail.com), Apr 23 2006


STATUS

approved



