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A217409 5-adic valuation of A217407. 2
17, 28, 3, 17, 4, 47, 7, 7, 54, 47, 159, 1610 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See main sequence, A217407.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

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

PROG

(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

CROSSREFS

Cf. A217407, A217408.

Sequence in context: A146776 A147218 A146856 * A256361 A293927 A269307

Adjacent sequences:  A217406 A217407 A217408 * A217410 A217411 A217412

KEYWORD

nonn,base,more

AUTHOR

James G. Merickel, Oct 02 2012

STATUS

approved

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Last modified June 26 06:36 EDT 2022. Contains 354877 sequences. (Running on oeis4.)