A069591 Smallest prime in which the n-th significant digit is a 7.

7, 71, 701, 7001, 70001, 700001, 7000003, 70000027, 700000001, 7000000001, 70000000033, 700000000009, 7000000000009, 70000000000009, 700000000000051, 7000000000000037, 70000000000000003, 700000000000000033

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Maple

7, seq(nextprime(7*10^j), j=1..32);

Mathematica

Join[{7}, NextPrime/@(7*10^Range[20])] (* Harvey P. Dale, Jun 17 2021 *)

Crossrefs

Cf. A069588, A069589, A069590.

Sequence in context: A196900 A319963 A198966 * A039920 A100895 A065537

Adjacent sequences: A069588 A069589 A069590 * A069592 A069593 A069594

Keyword

base,nonn

Author

Amarnath Murthy, Mar 25 2002

Extensions

More terms from Sascha Kurz, Mar 28 2002

Status

approved