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A064011 Sum of distinct primes dividing n! + 1. 1
2, 3, 7, 5, 11, 110, 71, 722, 359, 329902, 39916801, 2834342, 75024430, 3790360510, 46271879, 1059865, 1538931, 123611150, 1713311273363902, 117897322430, 2703876255255, 93799610095770191, 148139754736864717 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..60

PROG

(PARI) sopf(n, s, fac, i)=fac=factor(n); for(i=1, matsize(fac)[1], s=s+fac[i, 1]); return(s);

for(n=1, 23, print(sopf(n!+1)))

(PARI) sopf(n)= { local(f, s=0); f=factor(n); for(i=1, matsize(f)[1], s+=f[i, 1]); return(s) }

{ for (n=1, 60, write("b064011.txt", n, " ", sopf(n! + 1)) ) } \\ Harry J. Smith, Sep 06 2009

CROSSREFS

Sequence in context: A221858 A139317 A117928 * A050367 A192175 A294205

Adjacent sequences:  A064008 A064009 A064010 * A064012 A064013 A064014

KEYWORD

easy,nonn

AUTHOR

Jason Earls, Sep 07 2001

STATUS

approved

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Last modified July 20 23:29 EDT 2019. Contains 325189 sequences. (Running on oeis4.)