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A070942 Values of n such that the first n terms of A055265 constitute a permutation of {1,2,3,...,n}. 3
1, 2, 3, 4, 7, 8, 9, 10, 17, 18, 19, 22, 23, 24, 43, 55, 56, 57, 73, 99, 136, 137, 142, 143, 202, 217, 218, 233, 234, 264, 281, 282, 287, 288, 289, 302, 303, 304, 387, 409, 414, 415, 491, 509, 520, 521, 528, 529, 532, 533, 553, 554, 555, 588, 652, 653, 654, 665 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Zak Seidov and Robert Israel, Table of n, a(n) for n = 1..1500 (first 286 terms from Zak Seidov)

MAPLE

S:= {1}: L:= {}:

a[1]:= 1: b[1]:= 1:

count:= 1:

for n from 2 to 10000 do

  for k in L do

    if isprime(k+b[n-1]) then

      b[n]:= k;

      S:= S union {k};

      L:= L minus {k};

      if L = {} then

        count:= count+1;

        a[count]:= n;

      fi;

      break;

    fi

  od:

  if not assigned(b[n]) then

    for k from max(S) + 1 do

      if isprime(k+b[n-1]) then

        b[n]:= k;

        if k = max(S) + 1 and L = {} then

           count:= count+1;

           a[count]:= n;

        fi;

        S:= S union {k};

        L:= {$1..k} minus S;

        break

      fi

    od

  fi;

od:

seq(a[i], i=1..count); # Robert Israel, Sep 10 2014

CROSSREFS

Cf. A055265.

Sequence in context: A261412 A112965 A152979 * A073798 A124375 A287664

Adjacent sequences:  A070939 A070940 A070941 * A070943 A070944 A070945

KEYWORD

nonn

AUTHOR

John W. Layman, Apr 15 2003

STATUS

approved

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Last modified December 7 05:14 EST 2019. Contains 329839 sequences. (Running on oeis4.)