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A064623 Primitive subsequence of A066031: terms of A066031 which are not a multiple of some previous terms. 3
30, 70, 84, 105, 231, 234, 260, 286, 456, 528, 532, 627, 646, 805, 897, 1116, 1122, 1275, 1364, 1581, 1665, 1798, 1924, 2064, 2150, 2275, 2565, 2632, 2958, 2967, 3055, 3213, 3339, 3526, 3861, 4070, 4543, 4824, 5025, 5152, 5487, 5658, 5840, 6164, 6461 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

MATHEMATICA

a = {30}; Do[ If[ IntegerQ[ n / Apply[ Plus, First[ Transpose[ FactorInteger[n]]]]] && Mod[ n, n - EulerPhi[n]] != 0 && First[ Union[ Mod[n, a]]] != 0, a = Append[a, n]], {n, 1, 10000} ]; a

PROG

(PARI) f(n)=my(f=factor(n)[, 1]); #f[, 1]>1 && n%sum(i=1, #f, f[i])==0

list(lim)=my(v=List(), p=2); forprime(q=p+1, nextprime(lim), for(n=p+1, q-1, if(f(n), for(i=1, #v, if(n%v[i]==0, next(2))); listput(v, n))); p=q); Vec(v) \\ Charles R Greathouse IV, Sep 08 2012

CROSSREFS

Sequence in context: A154055 A270758 A241192 * A112343 A182996 A164596

Adjacent sequences:  A064620 A064621 A064622 * A064624 A064625 A064626

KEYWORD

nonn

AUTHOR

Robert G. Wilson v and Vladeta Jovovic, Dec 12 2001

STATUS

approved

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Last modified December 4 21:33 EST 2016. Contains 278755 sequences.