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A082463
Numbers n such that
A072181
(n) + 1 is prime.
1
1, 2, 3, 4, 5, 6, 7, 9, 10
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OFFSET
1,2
COMMENTS
a(10), if it exist, is greater than 47; any corresponding primes would have more than 40,000 decimal digits. -
Charles R Greathouse IV
, Oct 16 2015
LINKS
Table of n, a(n) for n=1..9.
PROG
(PARI) stepA072181(k, n)=if(n<3, return(n)); my(f=factor(k), g=factor(n), p=Set(concat(f[, 1], g[, 1])), x=((f, p) -> my(i=setsearch(f[, 1]~, p)); if(i, f[i, 2], 1)), e=apply(q->x(f, q)*x(g, q), p)); factorback(concat(Mat(p~), e~))
for(n=1, 1e4, k=stepA072181(k, n); if(ispseudoprime(k+1), print1(n", "))) \\
Charles R Greathouse IV
, Oct 16 2015
CROSSREFS
Sequence in context:
A126072
A265570
A265554
*
A368432
A194962
A072793
Adjacent sequences:
A082460
A082461
A082462
*
A082464
A082465
A082466
KEYWORD
hard
,
more
,
nonn
AUTHOR
Naohiro Nomoto
, Apr 26 2003
STATUS
approved
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Last modified April 19 04:29 EDT 2024. Contains 371782 sequences. (Running on oeis4.)