Primes sorted by relation of largest divisors of p+-1

Hugo Pfoertner all at abouthugo.de
Sat Feb 19 19:13:04 CET 2005


SeqFans,

can someone with Mmca, Maple, Pari etc. please check the correctness of
the two sequences:

%S A103666 5 13 17 19 37 41 43 61 67 73 97 101 109 113 137 151 157 163
181 193 197 211 229 241 251 257 271 277 281 283 313 331 337 353 379 397
401 409 421 433 443 457 463 487 491 521 523 541 547 577 601 613 617 631
641 661 673 677 691 701 709 727 733 751 757 761 769 787
%N A103666 Primes p such that the largest prime divisor of p-1 is less
than the largest prime divisor of p+1.
%e A103666 a(1)=5 because the largest prime divisor of 4 is less than
the largest prime divisor of 6.
%Y A103666 Cf. A023503 greatest prime divisor of n-th prime - 1, A023509
greatest prime divisor of n-th prime + 1, A103667.
%O A103666 1
%K A103666 ,nonn,

%S A103667 7 11 23 29 31 47 53 59 71 79 83 89 103 107 127 131 139 149
167 173 179 191 199 223 227 233 239 263 269 293 307 311 317 347 349 359
367 373 383 389 419 431 439 449 461 467 479 499 503 509 557 563 569 571
587 593 599 607 619 643 647 653 659 683 719 739 743 773 797 809
%N A103667 Primes p such that the largest prime divisor of p-1 is
greater than the largest prime divisor of p+1.
%e A103667 a(1)=7 because the largest prime divisor of 6 is greater than
the largest prime divisor of 8.
%O A103667 1
%K A103667 ,nonn,

I had to do some manual editing, copy and paste and therefore errors
might have occurred.

Thanks

Hugo Pfoertner





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