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Search: a077491 -id:a077491
Displaying 1-2 of 2 results found. page 1
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A088401 Duplicate of A077491. +20
0
5, 1, 6, 2, 7, 3, 8, 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 99, 149, 199, 249, 299, 349, 399 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
KEYWORD
dead
STATUS
approved
A069532 Smallest even number with digit sum n. +10
20
10, 2, 12, 4, 14, 6, 16, 8, 18, 28, 38, 48, 58, 68, 78, 88, 98, 198, 298, 398, 498, 598, 698, 798, 898, 998, 1998, 2998, 3998, 4998, 5998, 6998, 7998, 8998, 9998, 19998, 29998, 39998, 49998, 59998, 69998, 79998, 89998, 99998, 199998, 299998, 399998, 499998 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
From Chai Wah Wu, Sep 15 2020: (Start)
a(n) = a(n-1) + 10*a(n-9) - 10*a(n-10) for n > 17.
G.f.: 2*x*(45*x^16 - 45*x^15 + 45*x^14 - 45*x^13 + 45*x^12 - 45*x^11 + 45*x^10 - 45*x^9 + 5*x^8 - 4*x^7 + 5*x^6 - 4*x^5 + 5*x^4 - 4*x^3 + 5*x^2 - 4*x + 5)/((x - 1)*(10*x^9 - 1)). (End)
a(n) = 2 * A077491(n). - Alois P. Heinz, Sep 15 2020
MATHEMATICA
t={}; Do[i=2; While[Total[IntegerDigits[i]]!=n, i=i+2]; AppendTo[t, i], {n, 48}]; t (* Jayanta Basu, May 18 2013 *)
PROG
(PARI) a(n) = {my(k = 2); while(sumdigits(k) != n, k+=2); k; } \\ Michel Marcus, Mar 18 2016
CROSSREFS
Cf. A000918 (smallest even number with bit sum n), A051885 (smallest number with digit sum n).
Cf. A077491.
KEYWORD
base,nonn,easy
AUTHOR
Amarnath Murthy, Apr 01 2002
EXTENSIONS
More terms from Ray Chandler, Jul 28 2003
STATUS
approved
page 1

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Last modified August 30 00:57 EDT 2024. Contains 375520 sequences. (Running on oeis4.)