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A065967 a(n) = n * Sum_{primes p dividing n} (1 + 1/p). 1
0, 3, 4, 6, 6, 17, 8, 12, 12, 27, 12, 34, 14, 37, 38, 24, 18, 51, 20, 54, 52, 57, 24, 68, 30, 67, 36, 74, 30, 121, 32, 48, 80, 87, 82, 102, 38, 97, 94, 108, 42, 167, 44, 114, 114, 117, 48, 136, 56, 135, 122, 134, 54, 153, 126, 148, 136, 147, 60, 242 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..1000

MAPLE

A065967 := proc(n) local i, j, k, t1, t2, t3; t1 := ifactors(n)[2]; t2 := n^1*add((1+1/(t1[i][1])^1), i=1..nops(t1)); end;

PROG

(PARI) { for (n=1, 1000, s=0; p=2; while (p<=n, if(n%p == 0, s+=(1 + 1/p)); p=nextprime(p + 1)); write("b065967.txt", n, " ", n*s) ) } \\ Harry J. Smith, Nov 05 2009

CROSSREFS

Sequence in context: A133689 A285895 A220345 * A117986 A248738 A070737

Adjacent sequences:  A065964 A065965 A065966 * A065968 A065969 A065970

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 09 2001

STATUS

approved

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Last modified April 19 19:04 EDT 2019. Contains 322290 sequences. (Running on oeis4.)