A094724 Decimal expansion of Sum(1/c^c) where c is nonprime.
1, 0, 0, 3, 9, 2, 7, 7, 4, 5, 7, 5, 6, 4, 3, 9, 3, 6, 0, 6, 7, 0, 8, 6, 4, 5, 4, 4, 7, 1, 6, 6, 6, 8, 3, 3, 4, 5, 4, 2, 7, 1, 0, 5, 6, 5, 5, 8, 8, 6, 4, 0, 6, 0, 8, 0, 1, 0, 5, 0, 3, 0, 7, 6, 1, 8, 9, 8, 5, 5, 2, 0, 9, 4, 8, 6, 5, 4, 5, 5, 1, 5, 7, 8, 8, 6, 0, 7, 9, 1, 6, 8, 4, 9, 4, 0, 0, 6, 1, 8, 9, 2, 9, 0, 6
Offset: 1
Examples
1/1^1+1/4^4 +1/6^6 +1/8^8+ ... = 1.003927745756...
Programs
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Mathematica
RealDigits[Total[1/#^# &/@Select[Range[100],!PrimeQ[#]&]],10,120][[1]] (* Harvey P. Dale, Nov 09 2014 *)
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PARI
ctothec(n) = { local(x,s,a); default(realprecision,300); s=0; print1(1","); for(x=1,n,if(!isprime(x),s+=1./x^x)); a=Vec(Str(s)); for(x=3,n,print1(eval(a[x]),",")); print(); print(s) }