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A139253 Toothpick primes: primes in the toothpick sequence A139250. 17
3, 7, 11, 23, 43, 47, 67, 79, 223, 251, 283, 347, 383, 571, 683, 719, 859, 1163, 1279, 1319, 1607, 1667, 1759, 1871, 2011, 2731, 2767, 2843, 2879, 3919, 4523, 4783, 4799, 4903, 5051, 6343, 6607, 7823, 8971, 9643, 11003, 11071, 11483, 11519, 12251, 12907 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Intersection of A000040 and A139250.

All Wagstaff primes A000979 are members of this sequence. - Omar E. Pol, Mar 12 2012

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..181

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), pp. 157-191. arXiv:1004.3036

Chris K. Caldwell and G. L. Honaker, Jr., Prime Curios! 2011

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Index entries for sequences related to toothpick sequences

FORMULA

A000040 INTERSECT A139250.

EXAMPLE

a(25) = 2011 because 2011 is the number of toothpicks after 60 stages in the toothpick structure of A139250 and it is also a prime number A000040.

CROSSREFS

Cf. A000040, A000979, A139250, A139251, A139252, A194810.

Sequence in context: A106935 A116362 A090918 * A283588 A283706 A284402

Adjacent sequences:  A139250 A139251 A139252 * A139254 A139255 A139256

KEYWORD

nonn

AUTHOR

Omar E. Pol, Apr 24 2008

EXTENSIONS

More terms from Omar E. Pol, Dec 20 2008

Terms beyond 2731 from R. J. Mathar, Jan 21 2010

STATUS

approved

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Last modified February 25 14:46 EST 2018. Contains 299654 sequences. (Running on oeis4.)