A230808 Smallest sets of 3 consecutive odd numbers that are primes or pseudoprime (base 2). The initial odd number is listed.

3, 641, 643, 4369, 25759, 33149, 87249, 129917, 157637, 212419, 332947, 451901, 656597, 656599, 831405, 1489665, 1608461, 2113665, 3020357, 3370637, 6212357, 6212359, 19092917, 31880577, 34487597, 38790749, 63560683, 81612105, 84028407, 86559045, 274014885

Offset

1,1

Links

Shyam Sunder Gupta, Table of n, a(n) for n = 1..5001

Jan Feitsma, Tables of pseudoprimes and related data

Example

641 is in sequence because 641, 643, 645 is a set of 3 consecutive odd number where 645 is pseudoprime base 2 and others are prime.

Crossrefs

Cf. A001567, A230559, A228575, A230668, A230715.

Sequence in context: A287890 A091261 A332163 * A158600 A092301 A229668

Adjacent sequences: A230805 A230806 A230807 * A230809 A230810 A230811

Keyword

nonn

Author

Shyam Sunder Gupta, Oct 30 2013

Status

approved