A217409 5-adic valuation of A217407.

17, 28, 3, 17, 4, 47, 7, 7, 54, 47, 159, 1610

Offset: 1

Author

James G. Merickel, Oct 02 2012

Keywords

• nonn
• base
• more

Comments

See main sequence, A217407.

Examples

			A217407=(3^35)*(5^17), so this sequence's first term is 17.
		

Crossrefs

Cf. A217407, A217408.

Programs

PARI

prDigits(n)=my(d=digits(n), v=vector(10)); for(i=1, #d, v[d[i]+1]++); for(i=1, 10, if(!isprime(v[i]), return(0))); 1
list(lim)=my(v=List(), t); for(a=0, log(lim+.5)\log(5), t=5^a; while(t<=lim, if(prDigits(t), listput(v, t)); t*=3)); apply(k -> valuation(k,5), vecsort(Vec(v))) \\ Charles R Greathouse IV, Sep 19 2013