A109166 - OEIS

A109166

Numbers n such that the concatenation of consecutive increasing numbers beginning with prime(n) and ending with prime(n+1) is prime; or n such that A111875(n) is prime.

1, 37, 58, 119, 130, 195, 292, 419, 453, 464, 561, 617, 618, 652, 679, 720, 762, 787, 827, 830, 945, 1034, 1090, 1139, 1191, 1200, 1344, 1383, 1386, 1451, 1496, 1519, 1774, 1783, 1820, 1822, 1911, 1966, 1973, 2018, 2128, 2219, 2247, 2378, 2566, 2644

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OFFSET

1,2

COMMENTS

Honaker's prime curiosity corresponds to a(2)=37. Concatenating all the increasing numbers from prime(1473480)=23428439 to prime(1473481)=23428523 produces a 680-digit prime (certified).

LINKS

Table of n, a(n) for n=1..46.

G. L. Honaker, Jr., Prime Curios

EXAMPLE

a(3)=58 because prime(58)=271 and prime(59)=277 and 271272273274275276277

is prime.

CROSSREFS

Sequence in context: A134222 A179150 A127023 * A090798 A000928 A073276

Adjacent sequences: A109163 A109164 A109165 * A109167 A109168 A109169

KEYWORD

easy,nonn,base

AUTHOR

Jason Earls, Aug 18 2005

STATUS

approved