A323391 - OEIS

A323391

Primes containing nonprime digits (from 1 to 9) in their decimal expansion and whose digits are distinct, i.e., consisting of only digits 1, 4, 6, 8, 9.

19, 41, 61, 89, 149, 419, 461, 491, 619, 641, 691, 941, 1489, 4691, 4861, 6481, 6491, 6841, 8419, 8461, 8641, 8941, 9461, 14869, 46819, 48619, 49681, 64189, 64891, 68491, 69481, 81649, 84691, 84961, 86491, 98641

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OFFSET

1,1

COMMENTS

There are only 36 terms in this sequence, which is a finite subsequence of A152313.

Two particular examples:

6481 is also the smallest prime formed from the concatenation of two consecutive squares.

81649 is the only prime containing all the nonprime positive digits such that every string of two consecutive digits is a square.

LINKS

Table of n, a(n) for n=1..36.

Chris K. Caldwell and G. L. Honaker, Jr., 81649, Prime Curios!

EXAMPLE

14869 is the smallest prime that contains all the nonprime positive digits; 98641 is the largest one.

MATHEMATICA

Select[Union@ Flatten@ Map[FromDigits /@ Permutations@ # &, Rest@ Subsets@ {1, 4, 6, 8, 9}], PrimeQ] (* Michael De Vlieger, Jan 19 2019 *)

PROG

(PARI) isok(p) = isprime(p) && (d=digits(p)) && vecmin(d) && (#Set(d) == #d) && (#select(x->isprime(x), d) == 0); \\ Michel Marcus, Jan 14 2019

CROSSREFS

Subsequence of A152313. Subsequence of A029743. Subsequence of A155024 (with distinct nonprime digits but with 0) and of A034844.

Cf. A029743 (with distinct digits), A124674 (with distinct prime digits), A155045 (with distinct odd digits), A323387 (with distinct square digits), A323578 (with distinct digits for which parity of digits alternates).

Sequence in context: A179849 A029489 A155024 * A248339 A133855 A280170

Adjacent sequences: A323388 A323389 A323390 * A323392 A323393 A323394

KEYWORD

nonn,base,fini,full

AUTHOR

Bernard Schott, Jan 13 2019

STATUS

approved