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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..37.

FORMULA

Involves triangular-indexed twin primes:

prime(a(n)) - prime(a(n)-1) = 2 for n>1 with a(1)=1.

CROSSREFS

Cf. A217916, A217919.

Sequence in context: A113067 A290890 A152689 * A000604 A153876 A036881

Adjacent sequences:  A217915 A217916 A217917 * A217919 A217920 A217921

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Mar 04 2013

STATUS

approved

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Last modified October 20 05:42 EDT 2017. Contains 293601 sequences.