A095215 Beginning with 2, greatest prime divisor of the concatenation of all previous terms.

2, 2, 11, 67, 3301, 670001, 670001, 2816573, 1962598272385996001, 13135299156148920427, 8195631610270280813458231, 252695623634706646276208461875953169850197045066143207, 381219345970368698157410442059827141986617742456355454248317851, 381219345970368698157410442059827141986617742456355454248317851

Offset

1,1

Links

Table of n, a(n) for n=1..14.

Example

Greatest prime divisor of 22 is 11, 2211 is 67.

Prog

(PARI) lista(nn) = {my(k=2, m); print1(k); for(n=2, nn, print1(", ", k=vecmax(factor(m=eval(Str(m, k)))[, 1]))); } \\ Jinyuan Wang, May 24 2020

Crossrefs

Sequence in context: A069648 A275869 A175976 * A264712 A217094 A076976

Adjacent sequences: A095212 A095213 A095214 * A095216 A095217 A095218

Keyword

nonn,base

Author

Amarnath Murthy, Jun 10 2004

Extensions

More terms from Robert Gerbicz, Jun 09 2007

Offset corrected and a(12)-a(13) from Donovan Johnson, Feb 19 2011

a(14) from Jinyuan Wang, May 30 2020

Status

approved