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A191002 Completely multiplicative function with a(prime(k)) = prime(k)*prime(k+1). 4

%I

%S 1,6,15,36,35,90,77,216,225,210,143,540,221,462,525,1296,323,1350,437,

%T 1260,1155,858,667,3240,1225,1326,3375,2772,899,3150,1147,7776,2145,

%U 1938,2695,8100,1517,2622,3315,7560,1763,6930,2021,5148,7875,4002,2491,19440,5929,7350,4845,7956,3127,20250,5005,16632,6555,5394,3599,18900

%N Completely multiplicative function with a(prime(k)) = prime(k)*prime(k+1).

%H <a href="/index/Di#divseq">Index to divisibility sequences</a>

%F a(n) = n * A003961(n). - Franklin T. Adams-Watters, Nov 25 2011

%o (PARI) a(n)=local(fm);fm=factor(n);prod(k=1,matsize(fm)[1],(fm[k,1]*nextprime(fm[k,1]+1))^fm[k,2])

%Y Cf. A003961, A200746.

%K nonn,mult

%O 1,2

%A _Franklin T. Adams-Watters_, Jun 16 2011

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Last modified August 1 02:49 EDT 2021. Contains 346379 sequences. (Running on oeis4.)