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

Author

Paolo P. Lava and Giorgio Balzarotti, Jul 08 2008

Keywords

• easy
• nonn
• base

Comments

Subset of A116700

Examples

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

Crossrefs

Cf. A116700.