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A217918
Positions of 2 in sequence A217916.
3
1, 4, 11, 29, 46, 121, 172, 191, 254, 1276, 1432, 1654, 2416, 2486, 5254, 9181, 9592, 10012, 10441, 11629, 12881, 14029, 14197, 16472, 20707, 22367, 23872, 24532, 24977, 26336, 26797, 27496, 28681, 29162, 37951, 38227, 40756
OFFSET
1,2
FORMULA
Involves triangular-indexed twin primes:
prime(a(n)) - prime(a(n)-1) = 2 for n>1 with a(1)=1.
CROSSREFS
Sequence in context: A113067 A290890 A152689 * A360447 A000604 A153876
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Mar 04 2013
STATUS
approved