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A099498 Semiprimes of the form A007925(n)=n^(n+1)-(n+1)^n. 1
7849, 3667649, 91171007, 2395420006033, 11877172892329028459041, 604107995057426434824791, 107174878415004743976428761769, 424678439961073471604787362241217 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

a(1)=7849 because 5^6-6^5=7849=47*167 is a semiprime.

CROSSREFS

Cf. A007925 n^(n+1)-(n+1)^n, A072179 n^(n+1)-(n+1)^n is prime, A099499 primes of the form n^(n+1)-(n+1)^n, A099497 n^(n+1)-(n+1)^n is a semiprime.

Sequence in context: A043520 A194352 A045277 * A045292 A115426 A206069

Adjacent sequences:  A099495 A099496 A099497 * A099499 A099500 A099501

KEYWORD

nonn

AUTHOR

Hugo Pfoertner (hugo(AT)pfoertner.org), Oct 19 2004

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Last modified February 17 17:35 EST 2012. Contains 206061 sequences.