A073176 First n-digit prime in "the sequence of odd integers": 135791113151719212325272931333537394143454749...

3, 79, 911, 5791, 79111, 31051, 1232527, 23252729, 113151719, 2527293133, 57911131517, 991011031051, 6769717375777, 41434547495153, 192123252729313, 4547495153555759, 31517192123252729, 71921232527293133353

Offset

1,1

Comments

Leading zeros count but are not printed (cf. A073428).

Links

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

Example

a(4)=5791 because first 4-digit prime in "the sequence of odd integers": 135791113151719212325272931333537394143454749... is 5791. Notice that a(6)=31051 because actually it is 031051, If we remove initial zeros, then a(6)=105107.

Mathematica

p200=Flatten[IntegerDigits[2*Range[200]+1]]; Do[pn=Partition[p200, n, 1]; ln=Length[pn]; tab=Table[Sum[10^(n-k)*pn[[i, k]], {k, n}], {i, ln}]; tas=Select[tab, PrimeQ]; Print[{n, tas[[1]]}], {n, 20}]

Crossrefs

Sequence in context: A364947 A064456 A347165 * A236574 A367249 A062660

Adjacent sequences: A073173 A073174 A073175 * A073177 A073178 A073179

Keyword

easy,nonn,base

Author

Zak Seidov, Aug 22 2002

Status

approved