A141818 "Early bird" prime numbers: write the natural numbers in a string 12345678910111213.... Sequence gives prime numbers which occur in the string ahead of their natural place.

23, 31, 41, 43, 53, 61, 67, 71, 73, 83, 89, 97, 101, 131, 151, 181, 191, 211, 223, 241, 251, 263, 271, 281, 311, 313, 317, 331, 353, 401, 419, 421, 431, 433, 461, 463, 491, 503

Offset

1,1

Comments

Subset of A116700

Links

Table of n, a(n) for n=1..38.

Example

"23" appears in 1"23"4567..., ahead of its position after "22", so is a member.

Crossrefs

Cf. A116700.

Sequence in context: A110677 A169640 A026051 * A390613 A060328 A390047

Adjacent sequences: A141815 A141816 A141817 * A141819 A141820 A141821

Keyword

easy,nonn,base

Author

Paolo P. Lava and Giorgio Balzarotti, Jul 08 2008

Status

approved