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A090635 Trajectory of 63 under the map k -> A003415(k) (taking the arithmetic derivative). 5
63, 51, 20, 24, 44, 48, 112, 240, 608, 1552, 3120, 8144, 16304, 32624, 65264, 130544, 264928, 678448, 1356912, 4979232, 19424016, 58272480, 226593936, 763164288, 3467499840, 16339520448, 65370077568, 295266178368, 1223245608192, 6931725175296, 40582548986112 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
REFERENCES
A. M. Gleason et al., The William Lowell Putnam Mathematical Competition: Problems and Solutions 1938-1964, Math. Assoc. America, 1980, p. 295.
LINKS
FORMULA
a(n+1) = A003415(a(n)), a(1) = 63. a(n) = 4*A129286(n-3) for n > 2. - M. F. Hasler, Nov 27 2019
PROG
(PARI) A090635(n, a=63)={if(n<0, vector(-n, n, if(n>1, a=A003415(a), a)), for(n=2, n, a=A003415(a)); a)} \\ For n<0 return the vector a[1..-n]. - M. F. Hasler, Nov 27 2019
CROSSREFS
Sequence in context: A202157 A145585 A033383 * A278825 A086859 A278827
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 14 2003
EXTENSIONS
More explicit name from M. F. Hasler, Nov 27 2019
STATUS
approved

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Last modified February 25 10:21 EST 2024. Contains 370318 sequences. (Running on oeis4.)