A048836 Decimal expansion of Sum_{n >= 2} (n / Product_{i=2..n} K(i)), where K(i) is the Kempner function A002034.

1, 7, 2, 8, 7, 5, 7, 6, 0, 5, 3, 0, 2, 2, 3, 4, 1, 2, 2, 4, 1, 1, 2, 7, 5, 2, 3, 0, 3, 8, 5, 3, 8, 7, 6, 7, 4, 5, 9, 6, 6, 0, 6, 7, 7, 9, 1, 4, 8, 5, 1, 3, 1, 0, 5, 2, 6, 6, 4, 7, 6, 9, 0, 5, 6, 3, 2, 4, 8, 6, 9, 5, 8, 8, 9, 3, 1, 3, 7, 2, 1, 7, 9, 7, 3, 8, 0, 4, 9, 7, 4, 6, 2, 5, 3, 7, 0, 1, 1, 9

Offset

1,2

References

I. Cojocaru, S. Cojocaru, The Third and Fourth Constants of Smarandache, Smarandache Notions Journal, Vol. 7, No. 1-2-3, 1996, 121-126.

Links

Table of n, a(n) for n=1..100.

Eric Weisstein's World of Mathematics, Smarandache Constants

Example

1.72875760530223...

Prog

(PARI)
S(n)=local(m); if(isprime(n), n, m=1; while(m!%n!=0, m++); m)
S4(a, k)=local(v, i, p, y); v=vector(k, i, S(i)); p=1; y=0.; for(i=2, k, p*=v[i]; y+=i^a/p); y
S4(1, 200) \\ Franklin T. Adams-Watters, Apr 18 2006

Crossrefs

Sequence in context: A259072 A107311 A363538 * A198673 A379556 A086236

Adjacent sequences: A048833 A048834 A048835 * A048837 A048838 A048839

Keyword

nonn,cons

Author

Charles T. Le (charlestle(AT)yahoo.com)

Extensions

More terms from Franklin T. Adams-Watters, Apr 18 2006

Name corrected by Sean A. Irvine, Jul 10 2021

Status

approved