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A084686
Take n-th prime p(n), rewrite it with digits in decreasing order to get b(n), then a(n)=(b(n)-p(n))/9.
1
0, 0, 0, 0, 0, 2, 6, 8, 1, 7, 0, 4, 0, 0, 3, 0, 4, 0, 1, 0, 0, 2, 0, 1, 0, 1, 23, 67, 89, 22, 66, 20, 66, 88, 88, 40, 66, 52, 66, 62, 88, 70, 80, 82, 86, 88, 0, 11, 55, 77, 11, 77, 20, 30, 55, 41, 77, 50, 55, 60, 61, 71, 47, 0, 2, 46, 0, 44, 44, 66, 20, 66, 44, 40, 66, 50, 66, 64, 1, 59, 58
OFFSET
1,6
LINKS
FORMULA
a(n) = A283001(A000040(n)). - Robert Israel, Nov 26 2019
EXAMPLE
a(7)=6 because p(7)=17, b(n)=71 and (71-17)/9=6.
MAPLE
f:= proc(n) local p, L, i;
p:= ithprime(n);
L:= sort(convert(p, base, 10));
(add(10^(i-1)*L[i], i=1..nops(L))-p)/9
end proc:
map(f, [$1..100]); # Robert Israel, Nov 26 2019
MATHEMATICA
Table[ -Prime[n]-FromDigits[Sort[ -IntegerDigits[Prime[n]]]], {n, 1, 100}]
CROSSREFS
Sequence in context: A327279 A021377 A261875 * A040164 A086353 A019786
KEYWORD
easy,nonn,base,look
AUTHOR
Zak Seidov, Jun 30 2003
STATUS
approved