A262630 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A262630

Base-10 representation of 1 and the primes at A262629.

1, 7, 31, 127, 5113, 303049, 130677919, 8561616127, 343370835961, 398015959727917, 6536129506258687661, 136824982467292060343, 1727891550586579544797, 518772379027828374941147, 33164398702973727192477403, 91254204345537698333055497929

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..300

EXAMPLE

n A262629(n) base-10 representation

1 1 1

2 111 7

3 11111 31

4 1111111 127

5 1001111111001 5113

MATHEMATICA

s = {1}; base = 2; z = 20; Do[NestWhile[# + 1 &, 1, ! PrimeQ[tmp = FromDigits[Join[#, IntegerDigits[Last[s]], Reverse[#]] &[IntegerDigits[#, base]], base]] &];

AppendTo[s, FromDigits[IntegerDigits[tmp, base]]], {z}]; s (* A262629 *)

Map[FromDigits[ToString[#], base] &, s] (* A262630 *)

(* Peter J. C. Moses, Sep 01 2015 *)

CROSSREFS

Cf. A262629. Subsequence of A016041 (except a(1)).

Sequence in context: A036282 A033474 A001896 * A282857 A296573 A180147

Adjacent sequences: A262627 A262628 A262629 * A262631 A262632 A262633

KEYWORD

nonn,base

AUTHOR

Clark Kimberling, Oct 02 2015

STATUS

approved