| 1, 2, 4, 8, 10, 12, 18, 19, 22, 24, 25, 32, 33, 35, 45, 56, 57, 58, 59, 60, 72, 73, 76, 81, 82, 84, 88, 100, 102, 103, 104, 105, 117, 118, 125, 136, 138, 142, 147, 149, 162, 188, 190, 192, 195, 201, 203, 206, 210, 212, 232, 240, 246, 252, 262, 264, 265, 269, 270, 280
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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7^2=49 and 4+9=13 is prime
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MAPLE
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P:=proc(n) local cont, i, k, w; if isprime(n) then cont:=0; while cont<1000 do cont:=cont+1; w:=0; k:=n^cont; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; if isprime(w) then print(cont); fi; od; fi; end: P(7);
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CROSSREFS
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Cf. A076203, A134532, A134534, A134535.
Adjacent sequences: A134530 A134531 A134532 this_sequence A134534 A134535 A134536
Sequence in context: A121519 A098968 A032368 this_sequence A089953 A100278 A075333
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KEYWORD
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easy,nonn,base
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Oct 30 2007
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