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A179262 Numbers n based on (the sequence of) primes with the property of the last digit being either 1 or 7 (ex.49) and which are sometimes prime themselves. 1
7, 17, 49, 97, 241, 337, 577, 721, 1057, 1681, 1921, 2737, 3361, 3697, 4417, 5617, 6961, 7441, 8977, 10081, 10657, 12481, 13777, 15841, 18817, 20401, 21217, 22897, 23761, 25537, 32257, 34321, 37537, 38641, 44401, 45601, 49297, 53137, 55777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

FORMULA

n = P^2*2-1

a(n) = A079704(n)-1 = 2*prime(n)^2-1. [From R. J. Mathar, Jul 08 2010]

CROSSREFS

Cf. A000040

Sequence in context: A104164 A192244 A110097 * A018672 A221591 A045821

Adjacent sequences:  A179259 A179260 A179261 * A179263 A179264 A179265

KEYWORD

nonn,base

AUTHOR

Frank Wals (frank.wals(AT)gmail.com), Jul 06 2010, Jul 09 2010

EXTENSIONS

More terms from R. J. Mathar, Jul 08 2010

STATUS

approved

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Last modified September 20 10:10 EDT 2019. Contains 327229 sequences. (Running on oeis4.)