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A089535 Semiprimes of the form 2^k + k. 3
6, 2059, 8388631, 17179869218, 576460752303423547, 590295810358705651781, 154742504910672534362390615, 39614081257132168796771975263, 664613997892457936451903530140172407, 10633823966279326983230456482242756731, 680564733841876926926749214863536423041 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

FORMULA

a(n) = 2^A085745(n) + A085745(n).

CROSSREFS

Cf. A006127, A085745, A089536, A089537.

Sequence in context: A209520 A279440 A004817 * A059081 A226461 A172943

Adjacent sequences:  A089532 A089533 A089534 * A089536 A089537 A089538

KEYWORD

nonn

AUTHOR

Ray Chandler, Nov 08 2003

EXTENSIONS

a(10)-a(11) from Jinyuan Wang, Jul 30 2021

STATUS

approved

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Last modified October 15 17:45 EDT 2021. Contains 348033 sequences. (Running on oeis4.)