OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..3000
EXAMPLE
a(4) = 19 is a term because 19 and 23 are consecutive primes with Sum_{19 < j < 23} A001414(j) = 9+10+13 = 32 = 2^5.
MAPLE
spf:= proc(n) local t; add(t[1]*t[2], t=ifactors(n)[2]) end proc:
R:= NULL: count:= 0: p:= 2:
while count < 100 do
q:= p; p:= nextprime(p);
L:= ifactors(add(spf(i), i=q+1..p-1))[2];
if nops(L) = 1 and L[1][2]>1 then
count:= count+1; R:= R, q;
fi
od:
R;
CROSSREFS
KEYWORD
nonn
AUTHOR
J. M. Bergot and Robert Israel, Apr 05 2021
STATUS
approved