The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A261511 Twin primes with both terms having distinct digits in descending order. 0
 3, 5, 7, 41, 43, 71, 73, 641, 643, 76541, 76543, 87641, 87643 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Numbers in this list are the pairs of twin primes listed in A052014 with both terms having distinct digits in descending order LINKS MATHEMATICA dsc[n_] := 0 > Max@ Differences@ IntegerDigits@n; Union@ Flatten@ Select[ Partition[ Prime@ Range@ 9000, 2, 1], #[[2]] - #[[1]] == 2 && And @@ dsc /@ # &] (* Giovanni Resta, Aug 26 2015 *) PROG (PARI) lista(nn=100000) = {v = []; forprime(p=2, nn, if (isprime(p+2) && (d=digits(p)) && (vecsort(d, , 12)==d) && (dd=digits(p+2)) && (vecsort(dd, , 12)==dd), v = concat(v, p); v = concat(v, p+2)); ); vecsort(v, , 8); } \\ Michel Marcus, Aug 23 2015 CROSSREFS Cf. A001097, A052014. Sequence in context: A037287 A163797 A130536 * A146972 A102742 A089044 Adjacent sequences:  A261508 A261509 A261510 * A261512 A261513 A261514 KEYWORD nonn,easy,fini,full,base AUTHOR Paolo Omodei-Zorini, Aug 22 2015 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 21 14:54 EDT 2020. Contains 337272 sequences. (Running on oeis4.)